Harmodotron
(产生毫米波的)电子束管, (正交场)毫米波振荡管
🗣️ 情景例句
Oh, Grandpa will be so pleased that you're wearing them.
噢 ，戴了它， 祖父一定会非常高兴。
When sorrows come, they come not single spies, but in battalions.
祸不单行。
I used to travel by air a great deal when I was a boy.
我在幼年的时候，曾多次乘飞机旅行。