He can swim breaststroke, backstroke and crawl.
他会游蛙泳、仰泳和自由泳。
While other styles like the breaststroke, front crawl, or backstroke can be swum easily even by beginners, the butterfly is a more difficult stroke that requires good technique to be feasible.
初学者也许能很容易地掌握蛙泳、自由泳或仰泳，但蝶泳却难得多，对游泳者的技术要求很高。
He can swim breast stroke, backstroke and crawl.
他会游蛙泳、仰泳和自由泳。
Swimming is both as a competitive sport and recreation. The principal swimming strokes are the crawl, backstroke, breaststroke and butterfly.
游泳既是竞赛运动又是娱乐。主要游泳姿式有爬泳、仰泳、蛙泳和蝶泳。
Holding the body on the side produces no more or no less drag resistance than holding it prone in crawl or backstroke.
保持身体在一侧的姿势产生的拖曳阻力相对保持身体水平的姿势来说是一样的，不多也不少。
The principal swimming strokes are the crawl, backstroke, breaststroke and butterfly.
主要游泳姿式有爬泳、仰泳、蛙泳和蝶泳。
Most swimmers use the tumble turn. It is the fastest turn and is used in the crawl and backstroke.
多数运动员采用翻腾式转身，因为这是最快的转身方式。
Most swimmers use the tumble turn. It is the fastest turn and is used in the crawl and backstroke.
多数运动员采用翻腾式转身，因为这是最快的转身方式。
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