fiber of red muscle

例句：

1. 1. The fabric is made from cotton fibers.
   这件衣服是用棉纤维制成的。
2. 2. The old carpet has many fibers that need to be replaced.
   旧地毯有许多需要更换的纤维。
3. 3. The new shoes have a thicker fiber content than the old ones.
   新鞋的纤维含量比旧鞋厚。