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母牛;奶牛；（有时统称）牛
A cow is a large female animal that is kept on farms for its milk. People sometimes refer to male and female animals of this species as cows .
例句
He kept a few dairy cows...
他养了几头奶牛。
Dad went out to milk the cows.
爸爸出去挤牛奶。
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雌性动物(如雌象、雌鲸等)
Some female animals, including elephants and whales, are called cows .
例句
...a cow elephant.
雌象
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婆娘;娘儿们
If someone describes a woman as a cow, they dislike her and think that she is unpleasant or stupid.
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VERB
恐吓;威胁;把…吓住
If someone is cowed, they are made afraid, or made to behave in a particular way because they have been frightened or badly treated.
例句
The government, far from being cowed by these threats, has vowed to continue its policy.
该政府丝毫没有被这些威胁吓住，发誓要继续执行其政策。
...cowing them into submission.
胁迫他们顺从
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PHRASE
很长时间;长期
If you say that someone can do something until the cows come home, but it will have no effect, you are emphasizing that it will have no effect even if they do it for a very long time.
例句
You can initiate policies until the cows come home, but unless they're monitored at a senior level, you won't get results.
你可以花很长时间来制定政策，但除非高层对之进行监管，否则不会有效果。