Femitron
场发射电子微波管
🗣️ 情景例句
I'm sorry I missed him. I had to work late.
很抱歉我错过了他醒着的时候。我必须工作到很晚。
When I slept, he was out.
当我睡了时候，他外出了。
and often are foolish enough to let the adolescents see that they are annoyed.
而且愚蠢地让孩子看出自己的烦恼。