strong enough to burn skin. 酸性强到足以腐蚀皮肤
Receptors in their skin detect minute movements in the water made by its prey. 皮肤上的探测器能觉察到 猎物引起的最微小的水流变化
they have all not only lost the pigment in their skin, 它们不仅失去了皮肤色素