collagen

例句：

1. 1. Collagen is a protein that gives skin its strength and elasticity.
   胶原蛋白是赋予皮肤强度和弹性的蛋白质。
2. 2. Collagen supplements are popular in the market for their potential health benefits.
   胶原蛋白补充剂因其潜在健康益处而在市场上备受欢迎。
3. 3. The skin of an aged person often lacks collagen, leading to wrinkles and dryness.
   随着年龄的增长，人的肌肤往往缺乏胶原蛋白，导致皱纹和干燥。