一种优质棉纤维，多光泽，尤其用做里衬式书的装订线。
A fine cotton fabric, usually glazed, used especially for linings and in the bindings of books.
乌龟总会对蟾蜍说，“你可太漂亮了，你的皮肤多光滑啊，多有光泽啊！”
Turtle would often say to Frog, “What fine, smooth skin you have. How it shines and glistens.”
纯毛燃烧时无火焰，冒烟、起泡、有臭味，灰烬多呈有光泽的黑色固体，用手指轻轻一压就碎。
Pure wool when burning, smoke, no flame blister, smelly, ash is glossy black solid, with a broken finger gently press it.
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