单词：force system
force system的用法和样例：
例句
- Such force systems are said to be statically indeterminate.这样的力系叫做静不定力系。
- It is clear that for non-concurrent force systems, similar statements could be made with regard to rotations.可清楚地看出对于非共点力系考虑转动时也可以作出相似的结论。
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