An ocean wave passing through deep water causes a particle on the surface to move in a roughly circular orbit, drawing the particle first towards the advancing wave.
穿过深水的海浪使水面上的一个微粒按照一种近乎圆形的轨道移动，先把微粒拉向前移动的海浪。
2
Then how USM works and how the ellipse trace of particle on the surface of stator forms are analyzed.
接着分析了超声波电动机的工作原理和定子表面质点椭圆运动的形成机理。
3
An ocean wave passing through deep water causes a particle on the surface to move in a roughly circular orbit.