您要查找的是不是：
- 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。
- pre vacuum pump 预备真空泵
- 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。
- 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。
- The shop repairs vacuum cleaners. 这家店修理吸尘器。
- The porter turned off the vacuum. 清洁工关掉真空吸尘器。
- pre vacuum 初真空
- The symbol for the speed of light in a vacuum. 表示真空中光速的物理符号
- Sealed under low pressure or a partial vacuum. 抽空密封的在低压或部分真空状态下密封起来的
- I spent a few days sampling the literature of social science. 我花了几天时间浏览有关社会科学的文献。
- Cook the pie for 20 minutes in a pre heated oven. 在经过预热的烤箱里烘烤馅饼20分钟.
- vacuum sampling method 真空采气法
- The pre - christmas period be always very busy . 圣诞节前这一段时间总是很繁忙的。
- Just pre the switch on your arm rest. 您按一下扶手上的那个开关就行了。
- They are well pre pared and never improvise. 他们总是有备而来，从不临时草率从事。
- Dirt and dust are drawn into a vacuum cleaner by suction. 污物和灰尘被吸入吸尘器。
- Q: Do you work well under stre or pre ure? 在压力下你能正常工作吗?
- We could not pull apart two plates which enclosed a vacuum. 如果两个盘子间是真空，我们就无法将它们分开。
