swimmer

The lifeguard watched carefully to ensure every swimmer stayed within the designated safe zone.

(Chinese) 救生员仔细观察，确保每位游泳者都留在指定的安全区域内。

She is a competitive swimmer who practices in the Olympic-sized pool for three hours every day.

(Chinese) 她是一名竞技游泳运动员，每天在奥林匹克标准游泳池练习三小时。