您要查找的是不是：
- Slide-valve vacuum pump is a usual mechanical oil seal vacuum pump. 滑阀真空泵是一种常见的油封式机械真空泵。
- Preliminary study on the sealing vacuum storage test of strawberry 草莓真空密封贮藏技术试验初报
- Cook the meat quickly at first to seal in the juices. 一开始要大火烧肉，以便保存肉汁。
- The putty gives a good seal round the window. 窗户四周泥的油灰密封效果很好。
- Some pumps and all vacuum cleaners work by suction. 有些泵和所有真空吸尘器都是借吸力工作的。
- Our foil packets seal the flavour in. 我们用锡纸包装以保持原味。
- This document carries the royal seal. 这份文件上盖有王室印章。
- His wife's death left him a vacuum in his life. 他妻子的去世使他的生活变得空虚。
- The seal on the bottle has perished. 瓶子的封记已经腐烂。
- Her husband's death left a vacuum in her life. 她丈夫的死使她的生活变得空虚。
- Some people are living in a vacuum. 有些人过着与世隔绝的生活。
- A vacuum cleaner is a handy household tool. 吸尘器是一种使用方便的家庭用具。
- He impressed his seal on the wax. 他在火漆上盖了他的私章。
- The shop repairs vacuum cleaners. 这家店修理吸尘器。
- The deal needs the government's seal of approval. 这一交易需经政府批准。
- The porter turned off the vacuum. 清洁工关掉真空吸尘器。
- Sealing is prohibited in many countries. 许多国家禁止捕海豹。
- Seal (up) the window to prevent draughts. 把窗户封起来以防风。
- A round seal affixed to a papal bull. 印玺一个圆形的教皇的正式宣布训令或法令的封印
- The symbol for the speed of light in a vacuum. 表示真空中光速的物理符号
