1. The entry of all expenditure is necessary.
   有必要把一切开支入账。
2. Death is the necessary end of life.
   死亡是生命必然的终结。
3. In certain conditions,answering back sarcastically is necessary.
   在某种情况下,反唇相讥是必要的。
4. It's necessary for us to study hard .
   我们必须努力学习。
5. It is necessary to set down these additional rules.
   有必要制定这些补充规则。
6. Defensibility is a necessary character of excellent dwelling environment.
   可防卫性是居住区环境质量的必要组成方面。
7. It is necessary to exercise caution when making commendations.
   做推荐时有必要谨慎一些。
8. The mechanic made the necessary adjustments to the engine.
   机械师对发动机作了必要的调整。
9. For the apolar compounds, the derivatization was not necessary.
   对于非极性化合物，不一定要进行这样的衍生化。
10. It is sometimes necessary to indulge a sick child.
    迁就一个生病的小孩有时是必要的。
11. They were plotting how to obtain the necessary information.
    他们正在策划如何获取必要的情报。
12. It is necessary that one should obey the law.
    一个人遵守法律是必要的。
13. Perseverance combined with energy is necessary to success in life.
    毅力加上精力是人生成功的要素。
14. It’s necessary for us to net the currant bushes.
    我们有必要用网盖上红醋栗树。
15. It is necessary to decrease the amount of coal used.
    必须减缩用煤量。
16. Cassie found it necessary to explain her blackened eye.
    凯茜发现有必要解释一下她发黑的眼睛。
17. Dream is the necessary psychal power in the common life.
    理想在生活中是一种必不可少的精神动力。
18. The children worried the necessary permission out of their father.
    孩子们缠着他们的父亲不放, 终于得到了许可。
19. The court is ineffective because it lacks the necessary enforcement machinery.
    法院效率低是因为缺乏必要的执行机制。
20. Is it necessary to decide between remunerative work and meaningful work?
    是不是一定要在高回报的工作与有意义的生活中间做一个选择呢？

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