Constant flexing of the structure concentrates stress, which leads to microscopic cracks.

这些构造部位的频繁伸缩使应力集中，导致微裂纹的产生。

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RESULTS: The drugs and charred drugs per milligram contain a constant number of microscopic characteristic particles.

结果：一定重量的单味药材和炮制品的显微特征微粒数为一常数。

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