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625 necessary—necessity—need
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necessary是形容词,表示“需要的”,多用作表语:
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Oxygen is necessary for life.氧是生命需要的。
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Sleep is necessary to health.睡眠是健康所必需的。
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常用It is necessary这种结构表示“有必要的”:
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It is necessary to fill in all these forms.有必要填写这些表格。
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Is it necessary that I should return it this morning?有必要今早把它还回来吗?
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It was necessary for them to stay another day.他们有必要再留一天。
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If (it is) necessary, you might shorten it.如果必要你可以把它缩短。
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也可用作定语:
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He didn’t have the necessary training.他没有必要的训练。
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I haven’t got the necessary tools.我没有必要的工具。
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I’ll make the necessary arrangements.我将做必要的安排。
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necessity /ni(ə)ˈsesi(ə)ti/是名词,主要有两个意思。一是“必要(性)”、“需要”:
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There is no necessity to hurry.没有必要匆忙。
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There was no necessity for you to do that.你没有必要这样做。
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What’s the necessity of leaving so early?有什么必要这样早走?
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I went only out of necessity.我去完全出于必要。
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Necessity is the mother of invention.有需要才有发明。(谚语)
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二是“必要的东西”、“必需品”:
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Food and clothing are necessities of life.衣食是生活必需品。
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Sleep is a necessity.睡眠是必不可少的东西。
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material necessities 物质需要
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daily necessities 日用必需品
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need也可用作名词,表示“需要”、“必要”(在日常生活中这个词比necessity用得更多):
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