wave group

例句：

1. 1. The ocean waves are crashing against the shore.
   海浪正拍打着海岸。
2. 2.The scientists observed a wave group moving across the sea surface.
   科学家们观察到一个波浪群正在海面上移动。
3. 3.The wave group was formed by the wind blowing over the calm water.
   波浪群是由风吹过平静的水形成的。