sentence: Silk fibers are very strong.
sentences_before: Silk' is a natural fiber made by the silk worm larvae. Silk is often used to make cloth. The cloth can be made into clothes, rugs, bedding, or can be used to write or paint on.
sentences_after: In the past, silk was used to make parachutes.
concept_name: silk fiber
headings: Silk
categories: Basic English 850 words Fibers Cloth