The concept of input wave impedance is introduced in order to generalize the developed theory to multi-layer medium cases.
接着引入输入波阻抗的概念，把理论推广到多层媒质的情况。
It is employed the concept of multi-scale coherent structures to study the mechanism of riblet surface drag reduction in turbulent boundary layer.
将湍流多尺度相干结构的概念引入沟槽壁面湍流边界层减阻机理的研究。
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