1
an eiderdown
eiderdown 作可数名词时指鸭绒被，复数形式为 eiderdowns。
He pulled an eiderdown over his knees.
他把一条鸭绒被拉到了膝盖上。
鸭绒被
eiderdowns — plural of eiderdown
先理解核心含义，再看它在真实句子里的用法。
鸭绒被
a soft quilt filled with the down of the eider duck
He pulled an eiderdown over his knees.
他把一条鸭绒被拉到了膝盖上。
绒鸭的绒羽,用于填充枕头和被褥
The down of the eider duck, used for stuffing pillows and quilts.
用这种绒羽填充的被褥
A quilt stuffed with this down.
In winter, I sleep under a warm eiderdown.
冬天，我盖一条温暖的鸭绒被睡觉。
She pulled the soft eiderdown up to her chin and closed her eyes.
她把柔软的鸭绒被拉到下巴处，然后闭上了眼睛。
The old eiderdown had been in the family for years.
这条旧鸭绒被已经在家中使用了好多年。
eiderdown 作可数名词时指鸭绒被，复数形式为 eiderdowns。
He pulled an eiderdown over his knees.
他把一条鸭绒被拉到了膝盖上。
eiderdown 作不可数名词时指鸭绒材料，通常不加复数。
This cushion is filled with eiderdown.
这个靠垫里填充的是鸭绒。
Not this
I bought eiderdown for the spare room.
Use this
I bought an eiderdown for the spare room.
当 eiderdown 指“鸭绒被”时是可数名词，前面需要冠词，所以用 an；只有指“鸭绒”这种材料时才作不可数名词。
Not this
There are two eiderdown on the bed.
Use this
There are two eiderdowns on the bed.
当 eiderdown 指“鸭绒被”时，复数形式是 eiderdowns，因此 two 后面必须用复数。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
鸭绒被
She snuggled under the warm eiderdown quilt.
她钻进温暖的鸭绒被里。
鸭绒枕
She fluffed the eiderdown pillow before getting into bed.
她上床前拍了拍鸭绒枕。
柔软的鸭绒被
He sank into the soft eiderdown and closed his eyes.
他陷入柔软的鸭绒被里，闭上了眼睛。
在鸭绒被下
On cold mornings, I stay under the eiderdown as long as possible.
在寒冷的早晨，我会尽量赖在鸭绒被里。
用鸭绒填充的
The duvet is filled with eiderdown, so it is very light and warm.
这床羽绒被填充了鸭绒，所以又轻又暖。
Use eiderdowns naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象一只绒鸭(eider)把身上的绒(down)铺成被子，就是eiderdown鸭绒被。
语域：neutral 常见场景：床上用品、羽绒/填充材料 该词两个名词义项（鸭绒、鸭绒被）整体较中性，通常用于被褥、家居用品或纺织材料等场景；没有明显正式或俚俗色彩，因此保守地选为 neutral。
这些以 -down 结尾的词（down、countdown、shutdown、breakdown、touchdown）都与 eiderdown 结尾的 /daʊn/ 音相同，但 eiderdown 重音在第一个音节，因此它们不是严格意义的押韵。注意：eiderdown 中的 'ei' 读 /aɪ/（像 eye），不是 /eɪ/；eider 读作 /ˈaɪdə/。不要把它误写作 'elderdown'。
Dictionary facts from ECDICT, WIKTIONARY.