electron tube
英
美
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Noun:
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electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
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用作名词 (n.)
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Not any air gets into the vacuum tube.
没有空气能进入真空管。
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Electron tubes are the main component for this machine.
真空管是这种机器的主要零件。
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In a radio tube there is a source of electrons.
在电子管中，有一个电子发射源。
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A tube or a transistor can amplify an incoming signal.
电子管和晶体管能放大输入的信号。
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