He can swim breaststroke, backstroke and crawl.

他会游蛙泳、仰泳和自由泳。

youdao

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。

youdao

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。

youdao