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手续

  • 代码
  • 文档
  • 账号
    • 周报
  • 服务器（邮箱，手机号）
    • github
    • gitlab
    • 云服务
      • 阿里云
      • 腾讯云
    • 虚拟机
    • 企业邮箱
    • 短信服务
    • 域名
    • 其它

Desktop clean

  1. .ssh
  2. chrome logout
  3. chrome clean syn item
  4. chrome 自动填充、密码管理
  5. local git file
  6. /download
  7. 我的文档
  8. /weixin
  9. QQ
  10. 桌面文档
  11. C:\Users\wj\AppData\Roaming\Typora\typora-user-images\
  12. ss
  13. resilio
  14. BaiduNetdiskDownload

Tools

Install google play

方法一：

“谷歌服务下载器”App

方法二：

https://www.apkmirror.com/

方法三：

  1. Google 服务框架
  2. Google Play Services
  3. Play Store

设计原则

  • 多考虑一个量级
  • 面向抽象，依赖倒置
  • 设计模式 == 词牌：菩萨蛮、满江红
  • 复用组件，对抗冗余
  • 模仿 spring boot 的做法，工具替代手工
  • 差异化就是大同小异
  • 可扩展性多使用多态

异步思考

异步/同步：对手方风险，当前任务跟其他任务 or IO 的关系，用户进程跟系统内核之间的关系。

阻塞/非阻塞：自己对自己好不好，自己跟自己的关系。

进程

IPC

  • 管道

  • 消息队列

  • 共享内存

  • 信号量和 PV 操作

  • 信号

  • Socket

  • Binder

https://zhuanlan.zhihu.com/p/465574868

Android Binder

Binder驱动、内存映射

https://juejin.cn/post/6844904113046568973#heading-8

https://zhuanlan.zhihu.com/p/35519585

https://zhuanlan.zhihu.com/p/133638518

驱动程序

软件驱动程序

在用户模式下运行的组件称为应用程序，在内核模式下运行的组件称为“软件驱动程序” 。

https://learn.microsoft.com/zh-cn/windows-hardware/drivers/gettingstarted/what-is-a-driver-

数据库

数据库

  • 文档数据库
    • lotus domino -- notes storage facillity
    • mongodb couchbase
  • 键值存储
    • couchbase
    • memcached
    • infinispan
    • gemfire
  • 图像数据库
    • neo4j
    • apache giraph

分表分库

主从复制，读写分离

事务隔离

https://cloud.tencent.com/developer/article/1937815

全文检索

Lucene

Apache Lucene set the standard for search and indexing performance. Lucene is the search core of both Apache Solr™ and Elasticsearch™.

https://lucene.apache.org/

Elasticsearch

Apache Solr

架构

Message

https://docs.spring.io/spring-boot/docs/current/reference/html/messaging.html

  • JMS
    • ActiveMQ
  • AMPQ
    • RabbitMQ
  • Apache Kafka
  • Apache Pulsar
  • RSocket

JNDI

Remote API

RPC

  • TCP
    • RMI
  • HTTP
    • gRPC
    • JSON RPC

CORBA -- TCP

SOAP -- WebService -- HTTP

RESTFUL

Axure RP Key

Axure rp 9.0.0.3727

Licensee: Freecrackdownload.com

Key: 5vYpJgQZ431X/G5kp6jpOO8Vi3TySCBnAslTcNcKkszfPH7jaM4eKM8CrALBcEC1

OBS Studio

录屏

DOCS

stable

开源

哪种协议

看软件作者的诉求， Apache v2/BSD/MIT/GPL/LGPL等都是常见的选择。一般来说，商业友好的License是Apache V2；学术界用的比较多的是BSD和MIT， 硬件或者内核相关用的是GPL和LGPL。

技术书

《Designing Data-Intensive Applications》

《数据密集型应用系统设计》

https://www.zhihu.com/tardis/zm/art/421245296?source_id=1005

https://github.com/Vonng/ddia

https://vonng.gitbooks.io/ddia-cn/content/

《微服务架构设计模式》

DistroWatch

DistroWatch

GitLab

GitLab

安装 https://gitlab.cn/install/

docker 安装 https://docs.gitlab.com/ee/install/docker.html

服务器上的 Git - GitLab

GitLab 社区版的 readme 文件

GitLab compared to other DevOps tools

Maintenance commands

Omnibus GitLab documentation

Bitnami GitLab

If no IP address is assigned,try reloading the IP address by executing the command below.

sudo /etc/init.d/networking force-reload

Start Or Stop Services

CMS

Mediawiki

https://bitnami.com/stack/mediawiki/installer

https://bitnami.com/stack/mediawiki/README.txt

npm

https://www.npmjs.cn/

Use Windows Build Tools npm module 

 npm install --global windows-build-tools --vs2015

Git

Git SCM

Source code management

**快照 **

Snapshot: 某一时刻数据的状态

快照流

book

https://git-scm.com/book/en/v2

对象：commit，tree，blob

https://git-scm.com/book/en/v2/Git-Internals-Git-Objects

引用：refs

https://git-scm.com/book/en/v2/Git-Internals-Git-References

删除敏感信息

https://docs.github.com/cn/github/authenticating-to-github/keeping-your-account-and-data-secure/removing-sensitive-data-from-a-repository

Command line instructions

Git global setup

git -c http.sslVerify=false clone 'url'

git config --system --unset credential.helper
git config --global http.sslVerify false  

git push -u origin master

git config --global user.name "0714weijia"
git config --global user.email "zxll760606@sina.com"

Create a new repository

git clone https://gitlab.com/0714weijia/test.git
cd test
touch README.md
git add README.md
git commit -m "add README"
git push -u origin master

Existing folder

cd existing_folder
git init
git remote add origin https://gitlab.com/0714weijia/test.git
git add .
git commit -m "Initial commit"
git push -u origin master

Existing Git repository

cd existing_repo
git remote rename origin old-origin
git remote add origin https://gitlab.com/0714weijia/test.git
git push -u origin --all
git push -u origin --tags

Status

git status --ignored
git add -f <pathspec>

Github

SSH key

Connecting to GitHub with SSH

Generating a new SSH key

Vagrant

  1. Install VirtualBox . You can download it from virtualbox.org, here.
  2. Install Vagrant. You can download it from vagrantup.com.
  3. Get started with Vagrant https://www.vagrantup.com/intro/getting-started/index.html

OpenSSL

OpenSSL Cookbook

KeyStore

JKS

doc

Linuxone

ssh linux1@148.100.245.68 -p 22 -i ~/.ssh/mykey.pem

SMTP

发送电子邮件的协议：SMTP

接收电子邮件的协议：IMAP、POP

IMAP：电子邮件存储在服务器上，发送的消息存储在服务器上，消息可以在多个设备上同步和访问。

POP：电子邮件存储在一个设备上，发送的消息存储在单个设备上，电子邮件只能从单个设备访问。

WebAssembly

https://www.zhihu.com/question/304577684

Gradle

https://scans.gradle.com/

Linux

Ubuntu

Ubuntu packages

Ubuntu.com/

Sudoers

Linux Shell Command

Cheatsheet of less's Keyboard

Introduction to Regular Expressions

cat /etc/issue
logout

出现 > 时,用 ' 补全.也可以尝试 /
ls *pp*
ls p*png
ls app.{css,html}
ls app.css app.html
ls *{jpg,JPG}

ls be[ae]r.png
bear.png beer.png

ls bea?.png
bean.png bear.png (A single question mark matches any one character.)

history

yum install -y man man-pages
man ls
man cowsay
apropos
man apropos
curl http://udacity.github.io/ud595-shell/stuff.zip -o things.zip
unzip things.zip
expr 2 + 2
hostname
host udacity.com
date

cat test.txt
diff
less test.txt
< (home)
> (end)
500 (page number)
/ string or expressions (search)
n (next occurrence)
N (previous occurrence)

ping 8.8.8.8
ctrl + C

sort
bbb
ccc
aaa
ctrl + D

bc
2+3*4
ctrl + D

vim
emacs
joe
nano

pwd
cd /
cd ..
cd $HOME/.profile == cd ~/.profile

mdkir
mv
rm
rmdir
cp

echo
echo $PATH

sudo find / -iname LocalSettings.php -print

ps aux
ps -elf
top
pstree -aup

安装finger,查看用户信息

sudo apt-get install finger
finger
finger vagrant
cat /etc/passwd
username:password:UID:GID:UID info:home directory:command/shell

创建新用户,为用户授权

sudo adduser student
ssh student@127.0.0.1 -p 2222
sudo cat /etc/sudoers (查看哪些用户有root权限,可以执行sudo命令)
sudo ls /etc/sudoers.d
sudo cp /etc/sudoers.d/vagrant /etc/sudoers.d/student

Sudoers

SSH 远程登录

sudo apt-get install openssh-server

(client)
ssh keygen

(server)
mkdir .ssh
touch .ssh/authorized_keys
nano .ssh/authorized_keys
chmod 700 .ssh
chmod 644 .ssh/authorized_keys

(log with ssh)
ssh student@127.0.0.1 -p 2222 -i ~/.ssh/id_rsa

sudo nano /etc/ssh/sshd_config
设置以禁止使用passwd登录
sudo service ssh restart
(or)
/etc/init.d/ssh start

File permissions

Read Write Execute
r = 4 w = 2 x = 1
r = 0 w = 0 x = 0 
chmod 641 .ssh/authorized_keys (更改文件权限)
Owner Group Everyone
rw- r-- --x
4+2+0=6 4+0+0=4 0+0+1=1
Octal 6 Octal 4 Octal 1

Ports

HTTP 80 HTTPS 443 SSH 22 DNS 53
FTP 21 POP3 110 SMTP 25
cat /etc/ssh/sshd_config 查看ssh端口

Firewalls

sudo ufw status
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow ssh
sudo ufw allow 22/tcp
sudo ufw allow www
sudo ufw enable

Configure A Static IP Address

configure-static-address

Linux tools

Webmin

webmin

install-webmin

wget

wget http://prdownloads.sourceforge.net/webadmin/webmin_1.900_all.deb

scp

git bash:
scp -r C:/Users/wj/Downloads/gerrit-2.15.1.war weijia@192.168.44.132:/home/weijia
scp -r root@149.28.209.204:/root/ d:/temp
scp -r -i ~/.ssh/linuxonekey.pem linux1@148.100.245.68:/home/linux1/fabric-samples/hyperledger-fabric-linux-amd64-1.4.2.tar.gz d:/temp

git config

git config --file $GERRIT_SITE/etc/gerrit.config httpd.listenUrl 'http://localhost:8080'

Command-line completion

https://docs.docker.com/compose/completion/

Network

WebSocket

STOMP

https://docs.spring.io/spring-framework/reference/web/websocket.html

https://docs.spring.io/spring-framework/reference/web/websocket/stomp.html

SockJS

  • websocket
  • Polling (轮询)
  • Long-Polling (长轮询)
  • xhr-streaming(串流)

TCP/IP

Message

  • HTTP -- Data
  • TCP -- Segment
  • UDP -- Datagram
  • IP -- Pack

FTP

Server

SERVER-U

Client

CuteFTP

FlashFXP

FTP Explorer

IP

分组交换技术

  • IP数据报：IP报文分组
  • IP虚电路：IP报文分组

信元交换技术

  • ATM：53字节的信元，核心路由器将IP报文切换为信元
    • 虚通路
    • 虚通道
  • MPLS：ATM IP交换和标记交换
  • MPLS-VPN

IPv4 address space

Here's a visualization of the entire IPv4 address space

Reserved IP addresses

test-ipv6

ip addr show

Find your default gateway

ip route show default
netstat -nr

Private address netblocks

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

Ubuntu

https://ubuntu.com/server/docs/network-configuration

Telnet

telnet 47.240.166.195 22

Netcat

sudo apt-get install netcat-openbsd tcpdump traceroute mtr

man nc
CLIENT/SERVER MODEL
nc -l 1234
nc 192.168.10.1 1234

printf 'HEAD / HTTP/1.1\r\nHost: en.wikipedia.org\r\n\r\n' | nc en.wikipedia.org 80

sudo lsof -i

Tcpdump

sudo tcpdump -n host 8.8.8.8
ping -c3 8.8.8.8

sudo tcpdump -n port 53
ping yahoo.com

sudo tcpdump -n port 80
printf 'HEAD / HTTP/1.1\r\nHost: example.net\r\n\r\n' |nc example.net 80

通信

WiFi 频率

2.4 GHz = 2 400 000 000 Hz
5 GHz = 5 000 000 000 Hz

5G通信频率

huawei 6000兆赫兹 = 6KMHz = 6GHz = 6 000 000 000 Hz
Qualcomm 28千兆赫兹 = 28KMHz = 28GHz = 28 000 000 000 Hz

带宽

频谱带宽 20MHz
数据容量带宽 1000Mb =  8 * 125M = 125MB

穿透技术

使用 github 开源项目 frp 进行内网穿透搭建

Cloud

关键技术

虚拟化

  • 发展
    • 大型机虚拟化
    • X86虚拟化
  • 分类
    • 按对象
      • 操作系统虚拟化：将操作系统及系统调用抽象为资源
      • 平台虚拟化：将硬件组件抽象为逻辑资源
    • 按方案
      • 软件虚拟化：截获或模拟物理平台访问
      • 硬件虚拟化：硬件本身提供截获和重定向支持
    • 按方式
      • 全虚拟化
      • 准虚拟化
  • 虚拟机监控器：核心的执行和管理层
  • 名称
    • Hypervisor或
    • VMM(Virtual Machine Monitor)
  • 作用
    • 管理虚拟机生命周期，创建、启动、关闭、销毁
    • 为虚拟机抽象出硬件环境，与硬件打交道
  • 类型

开源虚拟化方案

  • KVM
    • 虚拟机，也叫Guest、客户机
    • 表现为进程
    • 保存为文件
      • 配置文件
      • 虚拟磁盘文件：镜像
  • Xen

弹性计算

虚拟化技术

将物理资源抽象为逻辑单元

  • 服务器虚拟化
    • CPU
    • 内存
  • 存储虚拟化
    • 固态硬盘
    • 机械硬盘
  • 网络虚拟化
    • 虚拟网卡
    • 虚拟交换机
    • 网络IP地址
      • 隔离，多租户
      • 转换，访问外网
  • GPU虚拟化

云服务名称

运行在Iaas层的服务

  • 实例
  • 虚拟机
  • 含计算服务的名称
  • 含弹性计算的名称

Distributed systems

Two basic tasks

There are two basic tasks that any computer system needs to accomplish:

  • storage
  • computation

Scalability

Scalability is the ability of a system, network, or process, to handle a growing amount of work in a capable manner or its ability to be enlarged to accommodate that growth.

  • Size scalability
  • Geographic scalability
  • Administrative scalability

Performance (and latency)

is characterized by the amount of useful work accomplished by a computer system compared to the time and resources used.

Depending on the context, this may involve achieving one or more of the following:

  • Short response time/low latency for a given piece of work 短时间
  • High throughput (rate of processing work) 高通量
  • Low utilization of computing resource(s) 少资源

Latency

The state of being latent; delay, a period between the initiation of something and the occurrence.

For example, imagine that you are infected with an airborne virus that turns people into zombies. The latent period is the time between when you became infected, and when you turn into a zombie. That's latency: the time during which something that has already happened is concealed from view.

Availability (and fault tolerance)

the proportion of time a system is in a functioning condition. If a user cannot access the system, it is said to be unavailable.

Formulaically, availability is: Availability = uptime / (uptime + downtime).

For example:

Availability % How much downtime is allowed per year?
90% ("one nine") More than a month
99% ("two nines") Less than 4 days
99.9% ("three nines") Less than 9 hours
99.99% ("four nines") Less than an hour
99.999% ("five nines") ~ 5 minutes
99.9999% ("six nines") ~ 31 seconds

Fault tolerance

ability of a system to behave in a well-defined manner once faults occur

Abstractions and models

  • System model (asynchronous / synchronous)
  • Failure model (crash-fail, partitions, Byzantine)
  • Consistency model (strong, eventual)

Design techniques: partition and replicate

There are two basic techniques that can be applied to a data set. It can be split over multiple nodes (partitioning) to allow for more parallel processing. It can also be copied or cached on different nodes to reduce the distance between the client and the server and for greater fault tolerance (replication).

Reference

http://book.mixu.net/distsys/intro.html

Java

https://docs.oracle.com/en/java/javase/14/

https://docs.oracle.com/javase/tutorial/

JIT

JIT(Just In Time Compiler)

HotSpot

Secure

Secure Coding Guidelines for Java SE (oracle.com)

Security Developer’s Guide

Java Secure Socket Extension (JSSE)

Java SE Security

JSON Web Token (jwt)

network

http://openjdk.java.net/groups/net/httpclient/

https://docs.oracle.com/javase/tutorial/networking/index.html

Docker

CLI

# 停止所有的容器
docker stop `docker ps -q`
docker stop `docker ps -a | grep Up | awk '{print $1}'`

# 打印停止的容器ID
docker ps -a | grep Exit | awk '{print $1}'
# 删除停止的容器
docker rm `docker ps -a | grep Exit | awk '{print $1}'`
docker rm `docker ps -q -f status=exited`
# 强制删除所有容器
docker rm -f `docker ps -aq`
docker container prune
docker container prune --force --filter "until=5m"
docker container prune --force --filter "until=2017-01-04T13:10:00"

Docker

Manage Docker as a non-root user

https://docs.docker.com/install/linux/linux-postinstall/#configure-docker-to-start-on-boot

如果希望 docker daemon 在系统启动的时候会自动启动的话，使用下边的命令

sudo systemctl enable docker

将你的用户添加到 docker 组

sudo usermod -a -G docker <username>
or
sudo usermod -aG docker $USER

Configure Docker to start on boot

sudo systemctl enable docker 
sudo systemctl disable docker

Start Docker

sudo systemctl start docker
sudo systemctl status docker

Install Docker Engine on CentOS

https://docs.docker.com/install/linux/docker-ce/centos/

Install using the repository on Ubuntu

https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository

Install from a package on Ubuntu

https://docs.docker.com/engine/install/ubuntu/#install-from-a-package

docker command

docker images
docker logs peer0.org1.example.com

Docker-Compose

Install Compose on Linux systems

安装docker-compose而非docker-compose-plugin最新版本

 sudo apt-get update
 sudo apt-get install docker-compose

或者参考下面的安装文档

https://docs.docker.com/compose/install/#install-compose

Apply executable permissions to the binary

sudo chmod +x /usr/local/bin/docker-compose

查看是否安装成功

docker-compose --version

问题

问题描述：

docker-compose segment fault

解决方法：

如果调用docker-compose的时候有segment fault错误，用sudo apt-get purge docker-compose卸载一下，同时清理/usr/local/bin 下面的docker-compose，然后重新安装sudo apt-get install docker-compose。

问题描述：

dial unix /var/run/docker.sock: connect: permission denied

解决方法：

https://stackoverflow.com/questions/51342810/how-to-fix-dial-unix-var-run-docker-sock-connect-permission-denied-when-gro

ls -last /var/run/docker.sock
cat /etc/group
cat /etc/group | grep docker

whoami //查看当前用户
echo $USER //打印当前用户
groups //查看所有群组
groups $USER //查看当前用户所在群组

sudo usermod -aG docker $USER //当前用户加入docker群组
sudo reboot //重启系统

Blockchain

IBM

https://hyperledgercn.github.io/hyperledgerDocs/

https://developer.ibm.com/series/ibm-blockchain-platform-console-video-series/

https://developer.ibm.com/cn/patterns/category/blockchain/

https://cloud.ibm.com/docs/blockchain?topic=blockchain-blockchain-component-overview

Solidity

Security

Reference

软件版本

standalone

代码发布打包的时候，有很多种方式，其中一种方式在打包的时候可以将整个项目中所用到的依赖包全部一起打包。一般叫做Standalone Application.j即可独立运行的应用。

这种打包方式的优点是显而易见的，即打包之后一个Jar即可运行。迁移快，成本低。相反的，其缺点是如果依赖包升级，则需要重新发布打包。所以这种方式适用于小项目，依赖包少的项目。

Java version

https://www.baeldung.com/oracle-jdk-vs-openjdk

JEE version

https://www.baeldung.com/java-enterprise-evolution

zentao

安装 Docker

https://docs.docker.com/engine/install/centos/

使用容器生成镜像

docker commit os_name image_name:version

安装 Docker Compose

https://docs.docker.com/compose/install/

查看版本

docker --version
docker-compose --version

Docker方式部署禅道

https://www.zentao.net/book/zentaopmshelp/405.html

创建docker网络驱动

sudo docker network create --subnet=172.172.172.0/24 zentaonet

启动禅道容器

示例1

sudo docker run --name zentao -p 80:80 --network=zentaonet --ip 172.172.172.172 --mac-address 02:42:ac:11:00:00 -v /app/zentaopms:/app/zentaopms -v /app/mysqldata:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=jdie34 -d easysoft/zentao:latest

示例2

sudo docker run --name zentaossl -p 443:443 --network=zentaonet --ip 172.172.172.173 --mac-address 02:42:ac:11:00:03 -v /zentaoapp/zentaopms:/app/zentaopms -v /zentaoapp/mysqldata:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=jdie34 -d easysoft/zentao:latest

访问容器

docker exec -it zentao /bin/bash

mysql配置

配置信息已经成功保存到 /app/zentaopms/config/my.php 中。可继续修改此文件。

<?php
$config->installed       = true;
$config->debug           = false;
$config->requestType     = 'PATH_INFO';
$config->timezone        = 'Asia/Shanghai';
$config->db->host        = '127.0.0.1';
$config->db->port        = '3306';
$config->db->name        = 'zentao';
$config->db->user        = 'root';
$config->db->encoding    = 'UTF8';
$config->db->password    = 'jdie34';
$config->db->prefix      = 'zt_';
$config->webRoot         = getWebRoot();
$config->default->lang   = 'zh-cn';

Linux一键安装开机启动

echo '/opt/zbox/zbox restart' >> /etc/rc.local
chmod +x /etc/rc.d/rc.local
reboot

禅道使用方法

https://www.zentao.net/book/zentaopmshelp/40.html

HTTPS

一、新建 docker 容器，映射 443 端口

二、获取证书文件 .pem，.key

将证书文件保存到 docker volume 指定的 host 主机目录中，例如 /zentaoapp/zentaopms/ssl

三、启用 ssl

docker exec -it zentaossl /bin/bash
apt upgrade apache2
a2enmod ssl
a2ensite default-ssl

详情阅读 https://ubuntu.com/server/docs/web-servers-apache

四、修改 ssl 配置文件

ssl 配置文件路径：

/etc/apache2/sites-available/default-ssl

配置证书路径：

/app/zentaopms/ssl/certs/projects.xdlianrong.com.pem
/app/zentaopms/ssl/private/projects.xdlianrong.com.key

配置 DocumentRoot：

DocumentRoot /app/zentaopms/www

配置 Directory

<Directory />
    SSLOptions +StdEnvVars
    Options FollowSymLinks
    AllowOverride All
    Require all granted
</Directory>

重启 apache2 服务

service apache2 reload

参考：

Nginx 反向代理实现 HTTPS

使用nginx配置反向代理,并且在nginx上配置证书即可.以下是详细步骤:

  1. 使用阿里云配置证书(可以选择OV免费版,按照提示操作即可)

  2. 在服务器上配置nginx:

    vim /etc/nginx/nginx.conf

    然后在打开的页面中找到server {}项,在里面配置:

    listen       443 ssl http2 default_server;
#listen       [::]:443 ssl http2 default_server; //ipv6,可以不配置
server_name  证书对应的域名;
root         /usr/share/nginx/html;//此处无需改动
ssl_certificate pem格式文件所在的目录;
ssl_certificate_key key格式文件所在的目录;
ssl_session_cache shared:SSL:1m;
ssl_session_timeout  10m;//超时时间
ssl_ciphers HIGH:!aNULL:!MD5;//加密组件,如有更安全或者更新的也可以使用
ssl_prefer_server_ciphers on;

  3. 启动nginx即可

nginx

数据备份

及时备份数据。

故障排除

禅道容器启动失败

首先考虑存储空间的问题(区块链节点会占用大量存储空间)

  1. 使用docker logs name查看对应容器的日志，name为容器名称

  2. 如出现 /etc/init.d/mysql: ERROR: The partition with /var/lib/mysql is too full!则为存储空间不足，需要使用 df -h 命令查看存储空间剩余，使用 du -sh查看当前目录下的空间占用

YOUYOU

2024.5.25 youyou撕坏了爷爷的一页书，没有人指责，自己哭了，好像在探索他人的反应，哭起来可以防御。

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