Harmodotron
(产生毫米波的)电子束管, (正交场)毫米波振荡管
🗣️ 情景例句
Guess who I ran into today?
你猜我今天碰见谁啦？
Which one is the longest river in China?
中国哪条河流最长？
Since its discovery, it has become a sort of potholers' Everest.
自从被发现以后，这个洞成了洞穴探险者的珠穆朗玛峰，