Despite its smooth external appearance, at the micro level, it has a coarse texture thanks to thousands of tiny teeth-like scales called dermal denticles.
鲨鱼的皮肤还有别的独到之处，虽然从外面看上去十分光滑但是在显微镜下有着粗糙的纹路鲨鱼皮肤表面布满了成千上万微小的齿状麟片。
Dermal denticle
原声例句
TED-Ed（视频版）
英语百科
Fish scale
（重定向自Dermal denticle）
The skin of most fishes are covered with scales. Scales vary enormously in size, shape, structure, and extent, ranging from strong and rigid armour plates in fishes such as shrimpfishes and boxfishes, to microscopic or absent in fishes such as eels and anglerfishes. The morphology of a scale can be used to identify the species of fish it came from.
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