各种PCB库、封装库，原理图等，史上最全的PCB元件库。-All kinds of PCB, encapsulation, library principle diagram, etc., most comprehensive library of PCB components in history.

PCB封装用于PCB的封装，大家可以参考一下谢谢啦(PCB encapsulation for PCB encapsulation, you can refer to it, thank you.)