真空管是一种内部气体全部或部分抽空的电子管，从而使电子在不受或少受气体分子的干扰下运动。
The vacuum tube is an electron tube from which all or most of the gas has been removed, permitting electrons to move with no or low interaction with any remaining gas molecules.
电子管或真空管。
电子管通常用来放大，而真空管则是电子管的另一名称。
An electron tube is generally used for amplification, and vacuum tube is another term for this device.
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