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
What's the meaning of NATO?
NATO代表什么？
But it looks like that's out of the question.
看现在看来不可能了。
Sorry, I don't know.
对不起，我不知道。