scalloping

例句：

1. 1.The scallops were swimming gracefully in the ocean.
   这些扇贝在海里优雅地游动。
2. 2.The fish was rolling on the sand.
   那条鱼在沙滩上翻滚。
3. 3.The leaves undulated gently in the breeze.
   树叶轻轻摇曳在微风中。