In chapter two, the (3 + 1) dimensional weakly nonlinear ion acoustic wave at higher order transverse perturbations in plasma was discussed and described by the Kadomtsev-Petviashvili (KP) equation.
论文第二章研究了等离子体中横向扰动下的(3 + 1)维弱非线性离子声波，得到了描述离子声孤波的(3 + 1)维kp方程。
In order to test the crack of the stroke oar leafs crossbeam of a certain helicopter, we need to design a special transverse wave probe.
为了检测某型直升机尾桨叶大梁的裂纹，需要设计专用横波探头。
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