But the inner cortex of thinner hair breaks off less evenly.

但较细毛发的内部皮层断裂茬口并不平整。

The microscope views revealed specific patterns of breakage in the keratin fibers, which are composed of a protective outer cuticle and an inner cortex that provides strength.

显微镜视图揭示了角蛋白纤维断裂的特定模式，角蛋白纤维由保护性外角质层和提供强度的内皮层组成。