[KongchangAI]
Unverified75% confidenceTradeoffTime unknown

浮力块置于背后的腰带能保持身体自然俯卧姿势利于学习游泳动作,但初学者容易前倾呛水;浮力块在腹前更稳但会让身体后仰不利于泳姿

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