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n. Ҫ�󣻱�Ҫ����������Ʒ

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n. demand��essential��necessary��prerequisite

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n.   inessential��nonessential

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1. Food is a requirement of life.
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2. Perhaps my requirement more than yours.
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3. Do myopia operation what to requirement need?
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n.
  1. required activity
  2. anything indispensable
  3. something that is required in advance

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requirement
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financial requirement
�ʽ���Ҫ; ��������; �ʽ���Ҫ -------[������ԭ��;
functional requirement
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operational requirement
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nutritional requirement
Ӫ����������Ҫ��; Ӫ��������Ҫ��; Ӫ����Ҫ; Ӫ����������(��);