The "fifth stroke," underwater dolphin, is the separator between good and great swimmers. Incorporating this frequently into training is extremely beneficial to your performance.
第五种泳姿、“水下海豚泳在一些优秀和顶级运动员中存在着。”这经常是相当有益的训练你要经常练习。
The butterfly stroke is similar to freestyle except that the arms circle together symmetrically and hence the body movement is more dolphin like.
蝶泳类似于自由泳，但它需要双臂一同划圈，这样身体的运动更像海豚。
The most physically demanding stroke, the butterfly features the simultaneous overhead stroke of the arms combined with the dolphin kick.
对身体条件最苛求的泳姿，蝶泳的特色是两臂同时越过头顶结合海豚式打腿。
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