Fiber is the American spelling of fibre — not a different word. It is a thin thread, or something made of those threads.

Fiber Fiber is the American spelling of fibre是fibre的美式拼法──not a different word不是不同的詞。It它 is a thin thread, or something made of those threads是一條細線，或是由那些細線做成的東西

Cotton cloth is full of them; so is a muscle, and so is a nerve. Factories also make fiber from plastic and weave it into clothes.

Cotton cloth棉布 is full of them裡面充滿了這種纖維；so is a muscle肌肉也是，and so is a nerve神經也是。Factories工廠 also make fiber from plastic也會用塑膠做出fiber，and weave it into clothes織成衣服

In food, fiber (often “dietary fiber”) is the part of plants your body does not really break down — apple skin, beans, brown bread — and it helps the stomach do its job.

In food在食物裡，fiber (often 'dietary fiber')fiber（常寫成「dietary fiber」） is the part of plants your body does not really break down是植物裡你身體其實無法真正分解的部分──apple skin, beans, brown bread蘋果皮、豆類、全麥麵包──and it helps the stomach do its job而且能幫助腸胃運作

People also say someone has “moral fiber” when they mean that person does not fold when things get hard; that phrase is not about food or cloth. And “optical fiber” (or just “fiber” in internet ads) is a glass thread that carries light.

People人們 also say someone has 'moral fiber' when they mean that person does not fold when things get hard也會說某人有「moral fiber」，意思是那個人在事情變難時不會垮掉；that phrase這個說法 is not about food or cloth跟食物或布料沒有關係。And而，'optical fiber' (or just 'fiber' in internet ads)「optical fiber」（網路廣告裡常常直接說「fiber」） is a glass thread that carries light是一條傳送光的玻璃線

British books keep the re: fibre. In Taiwan you will see both, because textbooks often lean British while American food labels and tech ads do not.

British books英式書籍 keep the re: fibre保留-re的拼法：fibre。In Taiwan在台灣 you will see both兩種拼法都會看到，because textbooks often lean British while American food labels and tech ads do not因為教科書常常偏英式，而美式的食品標籤和科技廣告則不是