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
When god closes a door, he opens a window.
山不转水转。
How long are you going to stay here?
你要在这里停留多久？
Television cameras and newspapers carried the news to everyone in the country.
电视摄像机和报纸把消息传送到全国。