A little apart from the surf ace, the longitudinal wave beam may exist and propagate parallel to the surface, yet has to connect with its corresponding gliding irrotational waves.
离开固体表面稍远的区域，可以有平行于表面传播的纵波声束存在，但是需要与相应的滑行集散波相互衔接。
2
From the production mechanisms, the catalytic waves of organic compounds are divided into catalytic hydrogen wave, parallel catalytic hydrogen wave and parallel catalytic wave.
由催化波的产生机理可将有机催化波分为催化氢波、平行催化氢波和平行催化波。
3
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.