由此提示，心瓣膜下游流场均匀性及湍流剪应力与瓣膜损害之间可能存在某种互为因果的关系，值得进一步研究。

This suggests that there might be a reciprocity between valvular lesion and flow field uniformity as well as turbulent shear stress, which should be further studied.

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而且波浪是海岸地区一个非常重要的海洋水动力因素，波浪作用下底部边界层的流态、底摩阻系数、床面剪应力和泥沙起动的理论还不成熟。

But the theory about the flow regime of the wave boundary layer, the wave friction factor, the bed shear stress and the initiation of sediment motion has not developed very well.

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壁面剪应力设计方法，从理论上把塞流顶替、低速顶替及紊流顶替技术统一起来。

Wall shear stress method integrates the plug flow displacing, the low speed displacing and the turbulent flow displacing methods in theory.

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