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
you know how Dad is always talking about
知道爸爸时常谈起
I usually get up at 8 o'clock.
我通常8点起床。
Debbie is only eleven years old and she hopes to set up a new world record.
黛比只有11岁，她希望创一项新的世界纪录。