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
Let me help.
我来帮忙。
An ass endures his burden,but not more than his burden.
驴子能负重，过重也难负。
On Wednesday evening, we went to the Town Hall.
星期三的晚上，我们去了市政厅。