您要查找的是不是：
- vacuum returnline system 真空回水系统
- 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。
- I suppose you also have a caste system in your society. 我想你们的社会里也有一种等级制度。
- The right to dissent is part of our political system. 有持异议的权利是我们政治体制的组成部分。
- 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。
- Do you know how to log in to the system? 你知道怎么登录进入这个系统吗？
- Public opinion was against the old feudal system. 公众舆论反对旧的封建制度。
- Her husband's death left a vacuum in her life. 她丈夫的死使她的生活变得空虚。
- The system works on the principle that heat rises. 该项装置是按照热力上升的原理运转的。
- 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 drainage system has been aged. 排水系统已经老化了。
- The shop repairs vacuum cleaners. 这家店修理吸尘器。
- They called for a radical reform of our tax system. 他们要求对税收制度进行根本改革。
- The porter turned off the vacuum. 清洁工关掉真空吸尘器。
- This is a highly efficient new heating system. 这是个高效的新取暖系统。
- He's mute on the subject of social system. 他对社会制度的问题保持沉默。
- The symbol for the speed of light in a vacuum. 表示真空中光速的物理符号
- He said he used this system in the year dot. 他说他很久以前用过这个系统。
- Our manager is conversant with account system. 我们的经理精通会计制度。
