essential

• Both induction and deduction are essential characteristics of rational thinking .
  归纳与推论都是理性思维的重要特征。
• A very rigid disease monitoring system is essential in such enterprises .
  这种企业必须有一种非常严密的疾病监测系统。
• In considering a problem , one must n't mistake the nonessentials for the essentials .
  看问题时，不要把支流当作主流。
• It is essential for the candidate to be dressed properly and to look alive .
  一个候选人必须衣着得体，看上去精神抖擞。
• It was essential that the europeans break away from slavish adherence to authority .
  欧洲人必须摆脱对权威的俯首听命。
• Nitrogen manuring is essential to get a good yield of cut herbage .
  为了获得刈割牧草良好的产量，使用氮肥是极为重要的。
• We may in fact, see for the first time what those essentials are .
  事实是，我们可能是第一次看出来那些本质的东西是什么。
• The tunipah development is essential to the growth and prosperity of california .
  图尼帕工程对加州的发展和繁荣至关重要。
• We must dispose of too many essential features of the investigated phenomenon .
  我们不得不排除所研究现象的许多基本特征。
• His support was essential to steer military appropriations through the congress .
  他的支持实质上是要使国会通过军事拨款。