Grammar Note
作为物质名词通常不可数；复数 cottons 表示不同种类或棉织品。
棉花；棉纤维
cottons — plural of cotton
先理解核心含义，再看它在真实句子里的用法。
棉花；棉纤维
the soft silky fiber obtained from cotton plants
Cotton is one of the most important natural materials in the clothing industry.
棉花是服装工业中最重要的天然材料之一。
一种纤维物质
A fibrous substance:
棉花植物的柔软丝状纤维的原始状态
soft silky fibers from cotton plants in their raw state
一种植物来源
A plant source:
由棉纤维织成的织物
fabric woven from cotton fibers
Many farmers in this area grow cotton to sell to textile factories.
这个地区的许多农民种植棉花卖给纺织厂。
This blanket is made of soft cotton and keeps me warm at night.
这条毯子是用柔软的棉布制成的，夜里让我保持温暖。
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作为物质名词通常不可数；复数 cottons 表示不同种类或棉织品。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.