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
Why are you leaving your present job?
你为什么要放弃目前的工作？
What day was yesterday?
昨天是星期几？
Hubei? I can't find it. Where is it?
湖北？我找不到，在哪儿？