hard vacuum

• 高真空,高度真空

hard vacuum的用法和样例：

例句

1. A high vacuum in the fuel tank can cause atmospheric pressure to collapse the tank.
   燃油箱内的高真空，会引起大气压力压塌油箱。
2. The method of increasing the unmaintained dewar high vacuum lifetime is clarified.
   提出了保持杜瓦长期高真空状态的方法。