The speed that piranhas do these bite rotations at is frighteningly ferocious which is what causes the infamous boiling water effect to appear on the surface of the river while they're feasting.

食人鱼轮流咬人的速度异常凶猛，这就是为什么当它们饱餐一顿时，河水表面会出现可怕狰狞的沸水效应。