rapids

例句：

1. 1. Therapids are treacherous andrequire caution.
   急流危险，需谨慎。
2. 2. The river isknown for its rapids andwaterfalls.
   这条河以其急流和瀑布而闻名。
3. 3. Rapids can bea dangerous part of the journey.
   急流是旅程中一个危险的部分。