Plifier
電子束半導體線性低通放大管
??? 情景例句
Well, when do you think you can come over to work?
你想什么時候開始工作呢？
By the time we got there,the play had already begun.
等我們到那里，戲已經開始了。
There is an interesting film on Channel one.
在一頻道有一部有趣的電影。