有必要

• 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。
• Gradually i began to realize the necessity for a more closely knit organization .
  我逐渐认识到有必要建立一个比较严密的组织。
• It is important to point out that laws and trends are radically different things .
  有必要指出，规律和趋势是根本不同的两回事。
• We have to get our people used to some propositions that are entirely new to them .
  我们有必要使我国人民对某些新鲜主张习惯起来。
• Policeman at last finds it necessary to support the law, and seizes a vocalist .
  后来，警察认为有必要维护法纪，便捉了一个唱歌的。
• That makes it necessary to bring the problem back to its proper setting .
  这一点使得我们有必要把这个问题放回到适当的范围里来考虑。
• She had no philosophy, and did not need any until her arrest in 1947 .
  她没有达观精神，直至1947年被捕，她才意识到有必要发扬达观精神。
• He had expressed his sense of urgency about the need for dramatic new recommendations .
  他表达了有必要提出激动人心的全新建议的迫切心情。
• The artist needs to communicate with his audience through a variety of masks .
  艺术家在他的生活和创作活动中有必要通过各种身份与读者交流。
• Spraying with insecticides and fungicides may be necessary to control any insects and diseases .
  也许有必要喷洒杀虫剂和杀菌剂以防止病虫害。