vacuum cap真空罩vacuumn.真空；真空吸尘器；空白adj.产生（利用）真空的v.用吸尘器打扫vacuum flash distillation真空闪蒸vacuum resistance welding真空电阻焊vacuum surface processing真空表面处理vacuum with gas quenching真空气淬vacuum discharge spectrum真空放电光谱vacuum resistance furnace真空电阻炉vacuum conductor rs valve真空紧急制动阀, 真空车长阀vacuum-aided mud-jack真空辅助压浆vacuum-sealing drainage封闭负压引流vacuum flask distillation真空快速蒸馏

1. The pressure in the vacuum is too low.
   真空度太小。
2. In this paper,a method of Vacuum measurement and calibration of vacuum interrupter will be introduced.
   详细介绍了一种真空开关管真空度测量及校准方法。