I assume that you already are familiar with the wavelike swimming technique.
介绍我假设你已经熟悉了波浪式的游泳技术。
Holding your breath tenses you up and that is bad for your swimming technique.
屏住呼吸让自己紧张，这对你的游泳技术是一件坏事。
Holding your breath tenses you up and that is bad for your swimming technique.
屏住呼吸让自己紧张，这对你的游泳技术是一件坏事。
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