a felt hat
felt 作定语直接修饰名词，表示“毡制的”。
She wore a black felt hat.
她戴着一顶黑色毡帽。
毛毡
毡帽；毡头笔；毡,由羊毛纤维滚压而成的无纺织物；由压缩的动物纤维制成的织物；毛毯
a cloth made of matted animal fibers
毡,由羊毛纤维滚压而成的无纺织物
A cloth or stuff made of matted fibres of wool, or wool and fur, fulled or wrought into a compact substance by rolling and pressure, with lees or size, without spinning or weaving.
由压缩的动物纤维制成的织物
a fabric made of compressed matted animal fibers
毡帽
A hat made of felt.
毡头笔
A felt-tip pen.
She cut a piece of felt to make a small hat.
她剪了一块毛毡来做一顶小帽子。
用法提示：名词，指一种压缩纤维制成的布料，作宾语
The table was covered with a green felt cloth.
桌子上铺着一块绿色的毛毡布。
用法提示：名词，指毛毡材料，作介词宾语
Felt is often used for craft projects because it doesn't fray.
毛毡常用于手工艺品，因为它不会磨损边。
用法提示：名词，指这种材料本身，作主语
felt 作定语直接修饰名词，表示“毡制的”。
She wore a black felt hat.
她戴着一顶黑色毡帽。
说明材质时常用 be made of felt。
The puppet is made of felt.
这个木偶是用毛毡做的。
毛毡作材料时通常不可数，计量用 a piece of felt。
She cut a piece of felt into a circle.
她把一块毛毡剪成圆形。
felt-tip pen 指毡头笔，是固定复合词。
He signed the form with a felt-tip pen.
他用毡头笔在表格上签了名。
grammar · medium
易错句子I need a felt to make a small bag.
正确表达I need some felt to make a small bag.
表示“毛毡”这种材料时，felt 是不可数名词，不能用 a/an 直接计数；应说 some felt 或 a piece of felt。
grammar · medium
易错句子The hat is made by felt.
正确表达The hat is made of felt.
表示制成品由某种材料做成时，英语用 be made of；by 通常引出动作的执行者或方式，不能用来引出材料。
baize 是机织后再起绒的粗羊毛织物，常染成绿色做台球桌布；felt 是不经编织、由羊毛纤维压结而成的毛毡。
fleece 指羊身上的羊毛，或柔软起绒的抓绒面料（常为化纤）；felt 是羊毛纤维压结成的无纺毛毡。
flannel 是经纬编织后轻度起绒的柔软织物，多用于衬衫；felt 不经过编织，是纤维压结而成的毛毡。
毡帽
She wore a gray felt hat.
她戴着一顶灰色毡帽。
毡头笔
He drew a map with a felt tip pen.
他用毡头笔画了一张地图。
毛毡织物
The bag is made of soft felt fabric.
这个包由柔软的毛毡织物制成。
毛毡垫
Put a felt pad under the vase to protect the table.
在花瓶下放一块毛毡垫以保护桌子。
毡靴
Children in the north often wear felt boots in winter.
北方的孩子冬天常穿毡靴。
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Dictionary facts from ECDICT, WIKTIONARY.