骨胶

例句：

1. 1. Collagen is a key component of skin and cartilage.
   胶原蛋白是皮肤和软骨的关键成分。
2. 2. Gelatin is often used as a binding agent in food preparation.
   明胶通常用作食品加工中的粘合剂。
3. 3. The collagen in our skin helps to keep it strong and elastic.
   我们皮肤中的胶原蛋白有助于保持其强韧和弹性。