Harmodotron
(产生毫米波的)电子束管, (正交场)毫米波振荡管
🗣️ 情景例句
Yes, I took part in.
有，我参加了。
Don't forget to thank him.
不要忘记谢谢他。
I bought two expensive dictionaries here half and hour ago, but I forgot to take them with me.
半小时以前我在这里买了两本很贵的辞典，但是我忘了拿走。