vacuum: n.(pl. vacuums, vac-ua )1.真空；空处，空虚，空白。2.〔美口〕吸尘器(＝ vacuum cleaner)。短语和例子a low [partial] vacuum低度[未尽]真空。 feel a vacuum in the lower regions 〔戏谑语〕觉得饿。vi.,vt.〔美口〕1.用吸尘器扫除。2.用真空干燥机干燥。adj.1.真空的。
You do get neat effects like cerenkov radiation ( that lovely nuclear reactor glow ) , but you ' re not violating causality or any of the other features of the light - speed limit because they ' re tied to the vacuum speed c 类似于契伦科夫辐射（核反应堆所发出的漂亮蓝光就由其产生）的奇妙效应确实存在，但你仍未打破光速的限制，因为所有这些速度最终都不能超过真空中的光速c 。
