The prevention of hip displacement has not been studied in a randomized trial as far as we know.

据我们所知，到目前为止还没有一个随机试验用来研究预防髋关节脱位。

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According to the spare thin-walled structure theory, the displacement trial functions are given by taking the "shear lag effect" into account.

根据空间薄壁结构理论并考虑简体结构的剪力滞后效应建立了简体结构的位移试函数表达式。

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