vacuum tube

vacuum-tube的词性：
n.Abbr. VT（名词）缩写 VT

1. An electron tube from which all or most of the gas has been removed, permitting electrons to move with low interaction with any remaining gas molecules.
真空管：一种内部空气全部或部分抽空的电子管，从而使电子在不受或少受空气分子的干扰下运动