I pushed off the bottom of the pool and spit out the water that got in my mouth. While treading water, I looked around to try and find Blake. He was no where to be found. Suddenly, something was pulling me underwater by my legs.
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This same lift force is generated while treading water.
当运动员进行踩水的时候也会有相同的上升力产生。
While treading water, one does not push down on the water.
当你做踩水动作时，你不会从水面之上向水下压水。
The park said Tuesday that all its 19 dolphins have been on a low fat diet since late August, when they started failing to hit jumping targets and keep upright while treading water.(See photo)
该公园9月30日说，园内19只海豚在表演时总是无法跳跃到规定高度，游弋时躯体也经常与水面垂直，于是从8月底开始只给它们食用低脂肪食物。
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