胶原蛋白可以保持皮肤紧致圆润。 随着年龄增长，细胞更新速度渐缓，成纤维细胞制造的胶原蛋白便逐步减少，来自阳光的紫外线、污染与吸烟等环境因素，则更加速这些变化。
As we age, cells typically begin to regenerate more slowly and those known as fibroblasts produce less collagen, a protein that keeps skin firm and supple.
不断增长的年龄、日益强烈的紫外线，都会导致松弛毛孔的形成。
Increasing age, the intensity of the ultraviolet rays, can lead to relaxation of pore formation.
一项研究在日本表示，某些化妆品可能会令人感到皮肤年龄过分暴露在紫外线。
A study undertaken in Japan indicated that certain cosmetic products may cause skin to age excessively when exposed to ultra-violet rays.
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