1. There´s not a particle of truth in his story.
    他的故事没有一点真实性.

2. 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，

3. Ion is electrically charged particle formed by losing or gaining electrons.
    离子是获得或失去电子后带电的微粒。

4. If we could actually see the path described by a particle, such as a sand grain in the rock,
    假如我们真能看到诸如岩石中一个沙粒子的运动轨迹，