You know this is your biggest mistake（你知道这是你最大的错误） You tread water（你踩水） Fighting for the air in your lungs（空气中的肺在战斗） ..
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下到水里游泳或踩水2至3分钟来唤醒你的身体。
Get in the water and swim (or tread water) for 2-3 minutes to get your body warmed up.
要是你以前看过救生员靠近溺水的人，你会看到救生员游到那个人身边，只是在踩水。
If you've ever watched a lifeguard approach a person who is drowning, you will see the lifeguard swim out to the person and then just tread water.
当你做踩水动作时，你不会从水面之上向水下压水。
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