单词	electron tube
释义	electron tube noun : an electronic device in which conduction by electrons takes place through a vacuum or a gaseous medium within a sealed glass or metal container and which has various uses based on the controlled flow of electrons Word History First Known Use 1919, in the meaning defined above Kids Definition electron tube noun : a device in which conduction of electricity by electrons takes place through a vacuum or a gas within a sealed container and which has various uses (as in radio and television)
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