This occurs in the skin's dermis, as a result of collagen and elastin fibers becoming hard, thick, and then binding together.
这是发生在皮肤的真皮层，由于胶原蛋白和弹力纤维越来越硬，厚而然后结合在一起。
Enzymes and free radicals can no longer break down collagen and elastin fibers, the process enabling development of wrinkles.
酶和自由基不再能破坏蛋白质和弹性纤维，从而抑制皱纹的产生。
Smoking also damages collagen and elastin — fibers that give your skin its strength and elasticity.
吸烟也会破坏胶原蛋白和弹性蛋白——纤维细胞，它将使你的皮肤具有韧性和弹性。
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