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。
It often goes out if I use the backhand-overhead-stroke.
如果我反手肩上击球，球常常出界。
It always goes out if I use the backhand-overhead-stroke.
如果我用反手肩上击球，球老是出界。
It always goes out if I use the backhand-overhead-stroke.
如果我用反手肩上击球，球老是出界。
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