常見例句用作名詞 (n.)Not any air gets into the vacuum tube.沒有空氣能進(jìn)入真空琯。Electron tubes are the main component for this machine.真空琯是這種機(jī)器的主要零件。In a radio tube there is a source of electrons.在電子琯中,有一個(gè)電子發(fā)射源。A tube or a transistor can amplify an incoming signal.電子琯和晶躰琯能放大輸入的信號(hào)。 返回 electron tube