When the skin is incapable of withstanding overstretching as the skin fibres reach their tensile capacity, stretch marks form.
2
而这种细菌分泌的酶来溶解皮肤纤维，在打击斑点，还会引起过敏性红斑。
And this bacterium secretes enzymes to dissolve the skin fibers, resulting in crack spots, also cause allergic red spot.
3
棱皮龟没有鲸脂，但它们有和爬行类动物相似的结构：厚且含油的皮肤，下面有一层纤维，再下面是脂肪组织。
Leatherbacks do not have blubber, but they do have a reptilian equivalent: thick, oil-saturated skin, with a layer of fibrous, fatty tissue just beneath it.
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