环形拉深筋经常用来内皱。
A round draw bead can prevent the forming of inner wrinkles.
对于揭示板料内皱曲的机理有重要意义。
It is of important meaning to reveal the mechanism of inner buckle.
实验室中经常发现在活细胞内，受压的微管皱曲为短波长的形状。
It is often observed that, in living cells, microtubules under compression severely buckle into short wavelengths.
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