Epithelial layers under compression avoid buckling by active contraction, but only up to a well-defined threshold at 35% strain, beyond which buckling occurs.

中文翻译：

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处于压缩状态的上皮层可避免因主动收缩而发生屈曲，但只能在35％的应变下达到明确定义的阈值，超过此阈值就会发生屈曲。