undulant wavelike

例句：

1. 1. The waves wereundulating gently as the tide receded.
   潮水退去时，波浪轻轻起伏。
2. 2. The sand was undulating inthe wind, creating a mesmerizing effect.
   沙子在风中起伏，创造出令人着迷的效果。
3. 3. The oceanfloor is undulatingbeneath the surface, revealing newlayers of sediment.
   海洋底部在表面下起伏，揭示出新的沉积层。