Poisson

例句：

1. 1. The ocean waves crashed against the shore.
   海浪冲击着海岸。
2. 2. The ripples on the lake were caused by the wind.
   湖面上的涟漪是由风造成的。
3. 3.The undulation of the water was evident in the distance.
   远处水面的波动很明显。