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VERB
（强烈）要求;强令
If you demand something such as information or action, you ask for it in a very forceful way.
例句
Mr Byers last night demanded an immediate explanation from the Education Secretary...
昨晚拜尔斯先生要求教育大臣立刻作出解释。
Russia demanded that Unita send a delegation to the peace talks...
俄罗斯要求安盟派代表团参加和谈。
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VERB
需要
If one thing demands another, the first needs the second in order to happen or be dealt with successfully.
例句
He said the task of reconstruction would demand much patience, hard work and sacrifice...
他说重建任务将需要付出极大的耐心、艰辛和牺牲。
There would be fewer international crises demanding his attention...
需要他去关注的国际危机将会减少。
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N-COUNT
（坚决的）要求
A demand is a firm request for something.
例句
There have been demands for services from tenants up there...
那里的房客要求提供服务。
They consistently rejected the demand to remove US troops...
他们一再拒绝撤走美国部队的要求。
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N-UNCOUNT
需求;需求量
If you refer to demand, or to the demand for something, you are referring to how many people want to have it, do it, or buy it.
例句
Another flight would be arranged on Saturday if sufficient demand arose...
如果需求量足够大，周六将再安排一趟航班。
Demand for coal is down and so are prices...
煤的需求下降了，煤价也相应下跌。
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N-PLURAL
所需（或要求）的事物
The demands of something or its demands on you are the things which it needs or the things which you have to do for it.
例句
Researchers wrongly assumed that people were quite clear about the demands of the task.
研究人员错误地认为大家都很清楚该项任务的要求。
...the demands and challenges of a new job...
新工作的要求和挑战
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PHRASE
很受欢迎;需求量大
If someone or something is in demand or in great demand, they are very popular and a lot of people want them.
例句
He was much in demand as a lecturer in the US.
他的讲座在美国很受欢迎。
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PHRASE
（对…）提出要求
If someone or something makes demands on you, they require you to do things which need a lot of time, energy, or money.
例句
I had no right to make demands on his time.
我无权占用他的时间。
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PHRASE
一经要求;承索
If something is available or happens on demand, you can have it or it happens whenever you want it or ask for it.
例句
...a national commitment to providing treatment on demand for drug abusers.
承诺在全国范围内为提出请求的吸毒者提供治疗