1
a down feather
down feather 是可数名词，单数形式常与不定冠词连用。
A down feather floats in the air.
一片绒羽在空中飘浮。
绒羽
先理解核心含义，再看它在真实句子里的用法。
绒羽
a soft fine feather from the underlayer of a bird's plumage, used for insulation
A down feather floats in the air.
一片绒羽在空中飘浮。
鸟绒羽
A feather of the down of a bird.
The duck's down feathers keep its chicks warm in the nest.
鸭子的绒羽让雏鸟在巢里保持温暖。
This sleeping bag is filled with down feathers and packs up very small.
这个睡袋填充了绒羽，收纳起来非常小。
She chose a coat with down feathers because it is light but warm.
她选了一件用绒羽做的外套，因为它轻巧又保暖。
down feather 是可数名词，单数形式常与不定冠词连用。
A down feather floats in the air.
一片绒羽在空中飘浮。
复数形式表示多片绒羽。
The pillow is filled with down feathers.
这个枕头填充了绒羽。
表示材质时常用 made of down feathers。
This jacket is made of down feathers.
这件夹克由绒羽制成。
比喻用法，形容轻盈。
The snowflake fell like a down feather.
雪花像一片绒羽般飘落。
Not this
I bought a down feathers jacket.
Use this
I bought a down feather jacket.
在英语中，复合名词作定语时，第一个成分通常用单数形式，即使它本身表示复数概念。“down feather”作为定语修饰“jacket”时，应用单数“down feather”，而非复数“down feathers”。
Not this
I need a down feather for winter.
Use this
I need a down jacket for winter.
“down feather”指羽绒本身，是一种材料或羽毛类型，不指代成衣。表示羽绒服等衣物时，应用“down jacket”或“down coat”，而不是将“down feather”作为衣服的名称。
Choose the next layer that will help you use down feather with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use down feather naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
可数名词，复数形式为 down feathers。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.