• 1. longitudinal wave motion: 纵波运动
• 2. longitudinal motion in wave: 波浪纵向运动

• 1.The conversion region, which transfers the energy of the transversal motion into longitudinal motion, is an important part of a cyclotron wave converter.
  能量转换区是回旋波整流器的一个重要组成部分，它把电子的横向能量转化为纵向能量。
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• 2.The 2-D nonlinear longitudinal wave in the isotropy solid medium studied in this paper is the finite amplitude wave, which thought about the nonlinear of the motion and medium.
  本文研究了各向同性固体介质中的二维非线性有限振幅纵波，采用有限元方法求解二维非线性纵波运动方程。
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