flood and ebb

• 潮汐

flood and ebb的用法和样例：

例句

1. The progression of tidal effects is both elegant and stately.
   潮汐作用的进程既精巧又威严。
2. Soon the water will become slack, and the tide will turn.
   很快水流就滞缓了，潮汐就要变了。