celastin

例句：

1. 1. The skin needs collagen to repair itself after injury.
   皮肤需要胶原蛋白来修复受伤后的自我。
2. 2. Collagen is a protein that gives strength and elasticity to the skin.
   胶原蛋白是一种赋予皮肤力量和弹性的蛋白质。
3. 3. As we age, our bodies produce less collagen, leading to wrinkles and other signs of aging.
   随着年龄的增长，我们的身体产生的胶原蛋白减少，导致皱纹和其他衰老迹象。