开始以单臂飞，呼吸每一拍，低一睁眼浸在水里，用直臂开始模拟的蝴蝶。
Start with single arm fly, breathing low on every stroke, with one goggle in the water, using a straight arm recovery to simulate butterfly.
开始以单臂飞，呼吸每一拍，低一睁眼浸在水里，用直臂开始模拟的蝴蝶。
Start with single arm fly, breathing low on every stroke, with one goggle in the water, using a straight arm recovery to simulate butterfly.
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