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- See above, for a coplanar system of concurrent forces to be in equilibrium it is necessary and sufficient that the resultant of these forces is zero. 从前述可知：平面汇交力系平衡的必要与充分条件是该力系的合力为零。
- A coplanar system of force couples is equivalent to a single couple lying in the same plane, the moment of which equals the algebraic sum of the moments of the component couples. 平面力偶系合成结果还是一个力偶,其力偶矩为各力偶矩的代数和。
- 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。
- 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。
- 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。
- The drainage system has been aged. 排水系统已经老化了。
- 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。
- 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。
- 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。
- The system can translate English into Chinese. 这个系统能将英语译为汉语。
- The caste system is still strong in India. 种姓制度在印度仍然很牢固。
- I can send him a note via the internal mail system. 我可以通过内部通信系统给他发个通知。
- A request for information from another system. 为查看另一系统中的信息而发出的一种请求。
- Most countries adopt metric system. 大多数国家采用米制。
- Many reforms must be made to the education system. 教育体制要作许多改革。
- The workmen fixed the water system. 工人们装好了供水系统。
