Valve amplifier
[計] 電子管放大器
?? 詞語組成解析
valve
[v?lv]
n. 閥;真空管;（管樂器的）活栓;（心臟的）瓣膜;
vt. 裝閥于;以活門調節;
??? 情景例句
Where there's a will, there's a way.
有志者事競成。
This is Lesson One.
這是第一課。
There are a lot of people in the swimming pool.
游泳池里擠滿了人。