Cathetron
[电]外控式三极汞气整流管
🗣️ 情景例句
Hi, Mr. Baker. We met before.
嗨， Baker先生， 我们以前见过面。
All one's geese are swans.
自吹自擂。
It looks as if she's gone away for a few days.
好象她要外出好几天了。