underswell

例句：

1. 1. The underwater creatures are fascinating to watch.
   水下生物令人着迷。
2. 2. The underswell caused the waves to grow larger.
   下涌引起了波浪变得更大。
3. 3. The underswell is a natural phenomenon that occurs when the ocean's surface water rises andflows beneath the surface.
   下涌是一种自然现象，当海洋表面水上升并流到水面之下时发生。