collagen fibers shrinking

例句：

1. 1. Collagen fibers are essential for skin health and can help reduce the appearance of fine lines and wrinkles.
   胶原蛋白纤维对皮肤健康至关重要，可以帮助减少细纹和皱纹的出现。
2. 2. As we age, our collagen fibers naturally shrink, leading to a loss of firmness and elasticity in our skin.
   随着年龄的增长，我们的胶原蛋白纤维自然收缩，导致我们皮肤的弹性和紧致度下降。
3. 3. In skincare products, collagen fibers are often used to improve skin's texture and firmness.
   在护肤品中，胶原蛋白纤维常被用于改善皮肤的质地和紧致度。