Femitron
场发射电子微波管
🗣️ 情景例句
It is! She's having pains a minute apart!
是啊。她隔一分钟就会痛呀。
How long will you remain in the country?
你将会在乡间逗留多久？
His previous attempts had been unsuccessful.
他以前的尝试没有成功。