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The following text is the video's original subtitle (Chinese):
什么是主板机
是把多部手机主板集成到一个机箱中
把不要旧手机主板摘下
接上直供线尾插线
点上热熔胶加工
贴上散热片
巧妙组安装置机箱卡槽内
一个主板就是一部手机功能
这就是主板机一套等于拥有20部手机
给机箱通上电源
连接网络
一键开机
三个静音风扇
冷风散热
确保机箱性能不受影响
用上投屏软件实现投屏
把20部手机高清画面逐一投屏电脑
每个手机都是单独IP
单独环境
网络互不干扰
一键可以同时操作20部手机
也可以单独操作指定一部手机

DeepL translate:
What is a motherboard unit
It's the integration of multiple cell phone motherboards into a single chassis.
Take off the motherboards of the old cell phones you don't need.
Connect the direct cable to the tail plug cable
Hot melt adhesive is applied.
Attach a heat sink
Skillfully install the device in the chassis slot
A motherboard is a cell phone function
This is a set of motherboards equal to 20 cell phones.
Power on the chassis
Connect to the network
One key to boot
Three silent fans
Cool air cooling
Ensure that the performance of the case is not affected
Use the screen casting software to realize screen casting
Throw 20 cell phones HD screen to computer one by one
Each cell phone is a separate IP
Separate environment
Network does not interfere with each other
One button can operate 20 cell phones at the same time
You can also operate one cell phone individually

Translated with DeepL.com (free version)