Sharks lack the gas bladder that allows bony fish to control their buoyancy precisely, for example, and instead have to rely on swimming, buoyant fatty livers and, occasionally, a gulp of air.
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比如鲨鱼没有硬骨鱼类用来精确地控制浮力的气体膀胱,但是它可以依靠游泳技术和有浮力的蓬松的肝脏来控制浮力,只需不是浮上水面吸上一口空气。
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