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a cow (countable noun)
A cow is grazing in the field.
一头牛在田野里吃草。
母牛
cows — plural of cow
先理解核心含义，再看它在真实句子里的用法。
母牛
an adult female of domestic cattle
A cow is grazing in the field.
一头牛在田野里吃草。
成年雌性家牛,尤指已产犊的
An adult female of the species Bos taurus, especially one that has calved.
LFBOT:明亮快速蓝色光学瞬变现象的同义词
LFBOT: Synonym of luminous fast blue optical transient.
家养牛的雌性
female of domestic cattle:
其他大型哺乳动物的雌性,包括牛科、驼鹿、鲸、海豹、河马、犀牛、海牛和象
A female member of other large species of mammal, including the bovines, moose, whales, seals, hippos, rhinos, manatees, and elephants.
The farmer milks the cow every morning before breakfast.
农夫每天早饭前给母牛挤奶。
A cow can eat a lot of grass in one day.
一头母牛一天能吃很多草。
We saw a black-and-white cow standing in the field.
我们看到一头黑白花的母牛站在田野里。
A cow is grazing in the field.
一头牛在田野里吃草。
The cow gives us milk.
这头牛给我们提供牛奶。
She milks the cow every morning.
她每天早上挤牛奶。
The farmer has ten cows.
农场主有十头牛。
Not this
I see cow.
Use this
I see a cow.
cow 是可数名词，单数形式前需要加不定冠词 a/an 或定冠词 the。
Not this
There are many cow.
Use this
There are many cows.
cow 是可数名词，复数形式为 cows，表示多只母牛时需要加 -s。
Not this
The cow is aggressive.
Use this
The bull is aggressive.
cow 特指母牛，成年雄性牛称为 bull（公牛）。描述攻击性动物时通常用 bull。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
挤牛奶
Every morning the farmer milks the cows.
每天早上农民挤牛奶。
奶牛
Dairy cows produce milk for consumption.
奶牛产奶供人们消费。
牛群
A herd of cows grazed in the field.
一群牛在田野里吃草。
牛牧场
The cows were led to the cow pasture.
牛被领到牛牧场。
牛粪
Cow manure is used as fertilizer.
牛粪被用作肥料。
摇钱树；稳定赚钱的生意或产品
The new smartphone became a real cash cow for the company.
这款新智能手机成了公司真正的摇钱树。
神圣不可侵犯的人或事物
In many organizations, the CEO is considered a sacred cow.
在许多组织中，CEO被视为神圣不可侵犯的人物。
大发雷霆；非常生气
Mom will have a cow when she sees the mess you made.
妈妈看到你弄的烂摊子会气疯的。
别激动，老兄！
When I accidentally spilled juice on his shirt, he said, 'Don't have a cow, man!'
当我不小心把果汁洒在他衬衫上时，他说：‘别激动，老兄！’
奶牛跳过了月亮。
Children often sing about the cow that jumped over the moon.
孩子们经常唱关于那头跳过月亮的奶牛的歌曲。
Use cows naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
发音类似'靠'，联想农民靠母牛产奶。
常见场景：farming、countryside 作为名词时通常指母牛，比较中性，多用于农场或农村场景。
可数名词，复数加-s
Dictionary facts from ECDICT, WIKTIONARY.