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a duck (countable noun)
I saw a duck swimming in the lake.
我看到一只鸭子在湖里游泳。
鸭；鸭子
先理解核心含义，再看它在真实句子里的用法。
鸭；鸭子
A waterbird with a broad flat bill and webbed feet, usually smaller and shorter-necked than geese and swans.
I saw a duck swimming in the lake.
我看到一只鸭子在湖里游泳。
有水的洞穴通道,顶部空气空间很低或没有。
A cave passage containing water with low, or no, airspace.
鸭科中某些水鸟,嘴扁平,脚有蹼,通常比天鹅和鹅体型小、脖子短。
Any of certain aquatic birds of the family Anatidae, having a flat bill and webbed feet, distinguished from swans and geese by generally being smaller and shorter-necked.
紧密编织的棉或亚麻织物,常用作帆布。
A tightly-woven cotton or linen fabric, often used as sailcloth.
爱称；宝贝；亲爱的。
A term of endearment; pet; darling.
I saw a duck swimming in the pond.
我看到一只鸭子在池塘里游泳。
The duck waddled across the path.
那只鸭子摇摇摆摆地穿过小路。
We fed the ducks some bread.
我们喂了鸭子一些面包。
I saw a duck swimming in the lake.
我看到一只鸭子在湖里游泳。
The swimmer ducked under the surface to avoid the waves.
游泳者潜入水面以下躲避波浪。
duck 可直接跟宾语，表示躲避某物。
He ducked the blow and counterattacked.
他躲开那一击并反击。
The kids ducked each other under the water playfully.
孩子们嬉闹着把彼此按进水里。
Not this
I saw duck in the pond.
Use this
I saw a duck in the pond.
鸭子（duck）作为可数名词，前面需要加冠词 a 或 the，汉语中没有冠词，学习者容易遗漏冠词。
Not this
He ducked from the ball.
Use this
He ducked the ball.
duck 作为及物动词表示'躲避'时，直接跟宾语，不需要介词 from。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
烤鸭
We ordered roast duck for dinner.
我们晚餐点了烤鸭。
猎鸭
He goes duck hunting every winter.
他每年冬天都去猎鸭。
橡皮鸭
The baby played with a rubber duck in the bath.
宝宝在浴缸里玩橡皮鸭。
鸭子池塘
Children fed the ducks at the duck pond.
孩子们在鸭子池塘喂鸭子。
毫无影响；不起作用
She told him he was lazy, but it was like water off a duck's back.
她告诉他他懒惰，但他对此毫不在意。
容易攻击的目标；坐以待毙的人
Without a plan, we're sitting ducks for the competition.
没有计划，我们就会成为竞争的靶子。
躲避；迅速隐蔽
When the fire alarm went off, we ducked and covered under our desks.
火警响起时，我们迅速躲在桌子下面。
如果它看起来像鸭子，游泳像鸭子，叫声像鸭子，那么它很可能就是一只鸭子。
If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck.
如果它看起来像鸭子，游泳像鸭子，叫声像鸭子，那么它很可能就是一只鸭子。
像鸭子入水一样自然
She took to the new job like a duck to water.
她对新工作如鱼得水。
Use duck naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象鸭子突然把头埋进水里躲开危险，这个动作叫duck，记住duck既是鸭子也是躲避。
中性语境；适用场景：日常对话、烹饪、自然观察等。通常为中性语体，无特殊文体限制。
作“鸭子”或“零分”解时为可数名词；作“鸭肉”解时为不可数名词
Dictionary facts from ECDICT, WIKTIONARY.