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1
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types of strokes [3]
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类型还是笔划 〔3〕
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Four basic categories are recognized by the International Amateur Swimming Federation (FINA): the breaststroke, the butterfly, the backstroke and freestyle (the crawl).
国际业余游泳联合会（FINA）承认四个基本类别：蛙泳、蝶泳、仰泳和自由泳。
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2
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butterfly stroke
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蝶泳
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Stroke on the stomach in which the two arms are thrust simultaneously toward the front and then brought backward.
腹部划水，两臂同时向前推，然后向后推。
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3
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butterfly turn
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蝴蝶转弯
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Movement for making a half turn; the swimmer touches the wall with both hands, pivots, then pushes from the wall with the feet.
转半圈的动作；游泳者用双手触碰墙壁，转动枢轴，然后用脚从墙上推开。
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4
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butterfly kick
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蝶式踢腿
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Vertical simultaneous movement of the legs that completes an undulation started by the upper body; the legs always stay together.
腿部的垂直同步运动，完成上半身开始的波动；两条腿总是在一起。
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