necessity

• Science arose from the practical necessity of dealing with everyday problems .
  科学出自人们处理日常问题的实际需要。
• The common conclusion was the uniqueness and necessity of euclidean geometry .
  欧几里德几何的唯一性与必要性已被公认。
• The sea-stories are sometimes weakened by the necessity for a heroine .
  这些海上小说有时因硬加上一个女主角而显得逊色。
• He talked fluently about "the necessity for every man to get on" .
  他却仍在滔滔不绝地讲述着，“每个人都必须奋发向前”。
• I do n't think there is any necessity to bring your plan up at the meeting .
  我认为没有必要在这次会议上重提你那个计划。
• Is it a logical necessity that higher wages will lead to higher prices ?
  工资一高物价就高，这是不是合乎逻辑的必然规律？
• This necessity would have presented no insurmountable bar to the visit .
  这一条件本来会对这次访问提出一个不可克服的障碍。
• Poverty hardened my heart, and my own necessities made me regardless of anything .
  贫困硬化了我自己的困苦使我不顾一切了。
• The chief figures in the government and in the field see the necessities of the situation .
  政府和战地首长须认清局势之所需。
• He perceives his delicate constitution, and the necessity of treating him tolerably .
  他看到他娇弱的体质，有必要对他宽厚些。