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
A little knowledge is dangerous.
一知半解最危险。
A good neighbour is better than a bother in the next village.
远亲不如近邻。
Last year was a bad year for the company. There was a big fall in sales.
去年公司不景气。销售额骤减。