swimmer

例句：

1. 1. She is a great swimmer and can swim for hours on end.
   她是一个很棒的游泳者，可以连续游几个小时。
2. 2. The children were swimming in the pool when it started to rain.
   孩子们在游泳池里游泳时开始下雨了。
3. 3.Swimmers need to be careful when entering the water because of the current.
   游泳者进入水中时需要小心，因为水流很大。