苹果和燕麦富含膳食纤维，对肠胃健康很有好处。

Apples and oats are rich in ___fiber, which is good for gut health.

这种面料由天然纤维制成，非常柔软舒适。

This fabric is made from natural ___fiber, which is very soft and comfortable.

面对挑战时，她展现出非凡的毅力和坚韧。

She showed great ___fortitude when facing the challenge.

这家公司正在铺设光纤网络以提高数据传输速度。

The company is laying ___fiber cables to improve data transmission speed.