2）Structural stability(结构的稳定性):the structure of an idiom is to a large extent un changeable. 习语的结构很大程度上难以改变。
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挖掘作业对邻近结构的稳定性造成威胁。
When digging operations pose a threat to stability of adjacent structures.
同时，改变这些木条的方向也可以保证整个结构的稳定性。
Also, the piles change their directions so as to guarantee stability.
结构的稳定性题目一直是刚架安全的一个非常重要的题目。
The problem of the structural stability has been a very important problem of the structural safe.
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