critical layer短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 临界层 The critical/span> layers of waves in parallel shear flow are generally classified into three kinds: viscosity critical/span> layer, nonlinear critical layer, and non- steady critical/span> 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。 cnki