a cotton + noun
cotton 作名词修饰语时直接放在另一个名词前，用单数形式，后面不加 of。
He bought a cotton shirt for the summer.
他买了一件棉布衬衫留夏天穿。
棉布；棉织物；棉株；棉花植株；一种纤维物质；棉花植物的柔软丝状纤维的原始状态；一种植物来源
the soft silky fiber obtained from cotton plants
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
这种物质制成的产品
A manufactured product of such a substance:
直立灌木状锦葵植物或小树,结有含有许多长毛纤维种子的棉桃
erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers
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。
用法提示：cotton 为不可数名词，指棉花/棉纤维，在句中作主语。
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。
用法提示：cotton 为不可数名词，指棉花作物/原料，作动词 grow 的宾语。
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。
用法提示：cotton 为不可数名词，指棉织物/材料，作介词 of 的宾语。
cotton 作名词修饰语时直接放在另一个名词前，用单数形式，后面不加 of。
He bought a cotton shirt for the summer.
他买了一件棉布衬衫留夏天穿。
cotton 指材料时是不可数名词，前面不加 a，也不用复数；表示“由……制成”常用 be made of/from cotton。
These sheets are made of pure cotton.
这些床单是用纯棉做的。
指田地里的棉花作物或原棉时，cotton 仍是不可数名词，前面不加冠词。
Farmers in the south grow cotton on a large scale.
南方的农民大规模种植棉花。
grammar · medium
易错句子I need to buy a cotton to sew a new shirt.
正确表达I need to buy some cotton to sew a new shirt.
cotton 表示“棉花；棉纤维”这种物质时是不可数名词，不能加不定冠词 a，也不能用复数 cottons 计量；要表示“一些棉花”用 some cotton。汉语说“一团/一块棉花”时可以数，学习者容易直接把“一个棉花”套成 a cotton。
grammar · medium
易错句子This dress is made by cotton.
正确表达This dress is made of cotton.
表示“由某种材料制成”用 be made of / be made from，不用 by；by 引出的是动作的执行者，如 made by my mother。汉语“由棉花做成”的“由”容易被迁移成 by。
grammar · medium
易错句子Cotton are grown in many parts of Xinjiang.
正确表达Cotton is grown in many parts of Xinjiang.
cotton 作“棉花”讲是不可数名词，作主语时谓语要用单数 is / was。汉语没有主谓一致的变化，学习者容易因为棉花“数量多”而误用复数动词 are。
脱脂棉；棉絮
She cleaned the cut with a piece of cotton wool.
她用一块脱脂棉清洗了伤口。
棉花糖（美式说法）
The children bought pink cotton candy at the fair.
孩子们在集市上买了粉色的棉花糖。
原棉
The factory imports raw cotton from Egypt every year.
这家工厂每年从埃及进口原棉。
棉田
The cotton fields stretched as far as we could see.
棉田一望无际。
棉花植株
The cotton plant needs plenty of sun and water.
棉花植株需要充足的阳光和水分。
Choose the next layer that will help you use cotton with more confidence.
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有机棉
This T-shirt is made of organic cotton.
这件T恤是用有机棉做的。