The critical layers of waves in parallel shear flow are generally classified into three kinds: viscosity critical layer, nonlinear critical layer, and non-steady critical layer.

平行切变流的临界层一般分为三类：粘性临界层、非线性临界层和非定常临界层。

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The critical layers of waves in parallel shear flow are generally classified into three kinds: viscosity critical layer, nonlinear critical layer, and non-steady critical layer.

平行切变流的临界层一般分为三类：粘性临界层、非线性临界层和非定常临界层。

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