As I gradually master my buoyancy and hover 15 feet below the surface, I can see schools of small yellow groupers beneath the dive boat giving wide berth to a blade of a barracuda.
当我逐渐适应了浮力，盘旋下潜到水面以下15英尺以后，就看见成群结队的黄色小石斑鱼为了躲避梭鱼而藏在潜水船下方。
But the fat content of the body may be of equal importance, because it determines your buoyancy and the amount of energy you must expend to simply stay on the surface of the water.
但是身体的脂肪含量也同样重要，因为它决定了你的浮力和让你停留在水面上必须花费的能量。
Because the duck walked in the water, feet can be reduced buoyancy, can float on the surface of the water, and won't sink.
因为鸭子在水中行走的时候，脚可以减少浮力，能浮在水面上走，而不会沉下去。
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