... residuary resistance 剩余阻力 resistance force of drag 拖曳阻力 restricted water 限制水域 ...
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抬头呼吸的问题是正如所见一样的身体行为和你的腿在下沉。这会增加额外的拖曳阻力。
The problem with lifting your head to breathe is that your body ACTS like a see-saw and your legs sink. This adds lots of extra drag.
保持身体在一侧的姿势产生的拖曳阻力相对保持身体水平的姿势来说是一样的，不多也不少。
Holding the body on the side produces no more or no less drag resistance than holding it prone in crawl or backstroke.
既然你的身体就象看围绕你的中心看到的行为一样，那么它会使你的你腿在水中下沉，产生额外的拖曳阻力。
Since your body ACTS like a see saw around your centre, this causes your legs to sink in the water, creating extra drag. 3.
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