Valve amplifier
[计] 电子管放大器
🧩 词语组成解析
valve
[vælv]
n. 阀;真空管;（管乐器的）活栓;（心脏的）瓣膜;
vt. 装阀于;以活门调节;
🗣️ 情景例句
That's like closing the gate after the horse has bolted.
那无异于马后炮。
I've never heard that piece before.Who wrote it?
我从来没听过那乐章，那是谁写的？
I don't know, he says. It isn't a plane, and it isn't a bike. I think we can say it's a plike.
“我不知道”，他说，“不是飞机，也不是自行车，我想可以把它叫飞车”。