Pnpn transistor
[电] PNPN晶体管
🧩 词语组成解析
🗣️ 情景例句
On a contract.
在一份合同上面。
You look very serious about something.
你似乎有很严重的事。
So I don't think she's left the college. And her papers and books are all over the desk.
所以我认为她还在学校。而且她的作业和课本都放在桌子上。