There are two disciplines within freestyle swimming: long distance and sprints.
自由泳这门学问中有两个学科：长距离泳和短距离泳。
Freestyle, butterfly, back stroke and breast stroke are four commonly seen strokes in swimming competition.
自由泳、蝶泳、仰泳和蛙泳是游泳比赛中常见的四种泳姿。
Push off deep under water, and start swimming freestyle.
在水的深处推水，并开始游泳自由泳。
Swimming freestyle can build your shoulder muscles.
自由式会锻炼你肩部的肌肉。
Swimming freestyle can build your shoulder muscles.
自由泳可以锻炼你肩部的肌肉。
Swimming freestyle can build your shoulder muscles.
自由泳可以锻炼你肩部的肌肉。
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