必要性的英文：
necessity

参考例句：
  • The bane of preemptive action is the impossibility of proving it was necessary.
    先发制人论者的致命弱点在于无法证明其行动的必要性。
  • But Japan, it seems, is still not ready and entirely convinced of the need to restructure and deregulate its economy
    但日本似乎仍未准备好，并未完全相信调整和缩小国家对经济的干预的必要性。
  • the need to economize scarce energy resources.
    节约使用稀有能源的必要性
  • To identify the necessities of the production in order to contribute with the definition of the industrial investment.
    明确生产的必要性以明确工业投资的范围。
  • Hoped to educate the voters to the need for increased spending on public schools.
    希望选民了解增加公立学校开支的必要性.
  • His speech highlighted the need for educational reform.
    他的演讲强调了教育改革的必要性。
  • The teacher urged on us the necessity of practice.
    老师向我们强调练习的必要性。
  • They urged on us the need for cooperation.
    他们向我们强调合作的必要性。
  • We should bethink ourselves of the necessity to raise more funds.
    我们必须考虑到筹集更多基金的必要性。
  • He urged the necessity for immediate action.
    他力陈马上采取行动的必要性。
necessity是什么意思：
n. 必然，必要；必需品；必然性，不可避免的情况
  • Is there necessity in nature?
    自然界是否存在必然性？
  • Necessity knows no law
    急需之下难顾法律
  • Necessity (or Need) has (or knows) no law
    需要面前无法律
  • Necessity is the mother of invention
    穷则变,变则通
  • Configuration is a necessity for expert users.
    对于专家用户来说，配置是必需的。

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