Spiratron
旋束管(离心静电聚焦行波管), 径向聚束行波管, 螺旋管
🗣️ 情景例句
What broke up their friendshop?
是什么破坏了他们的友情呢？
I'm sorry. I can't make it on Tuesday.
对不起，星期二我无法参加。
Best wishes,
衷心地祝福你，