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游泳运动员;游泳爱好者;游泳者
A swimmer is a person who swims, especially for sport or pleasure, or a person who is swimming.
例句
You don't have to worry about me. I'm a good swimmer...
你不用担心我。我水性很好。
She wants to become an Olympic swimmer...
她想成为一名能够参加奥运会的游泳运动员。