In a sense, the semantics of a relation are quite similar to those of a constraint.

在某种意义上，一个关联的语义与一个限制十分相似。

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It is also the history of relation between market freedom and state constraint.

也就是“市场自由与国家强制”关系的演变与历史变迁过程。

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Then, the preferential constraint relation of sub-assembly is judged by matching assembly knowledge. The algorithm efficiency of generating assembly process APS-tree is improved.

然后，利用装配知识判定子装配体的装配优先约束关系，提高由装配结构树生成装配工艺APS树的效率。

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