There had never been any necessity for her to go out to work.(她从来就没有出去工作的必要。)
Sometimes convenience or practical necessity or just the fancy of an influential person can establish a fashion.(有时，某种便利或实际的需要，或仅仅是一个有影响力的人物的幻想就可以引领一种时尚。)
At the same time, people continue to treat fire as an event that needs to be wholly controlled and unleashed only out of necessity, says Professor Balch at the University of Colorado.(与此同时，人们仍然认为火是一种需要完全控制的事件，只有在必要的时候才能释放出来，科罗拉多大学的鲍尔奇教授说。)
As soon as the necessity for action is over the troops must be withdrawn.(一旦军事行动的必要性不复存在，部队必须撤离。)
If you are a manager of technology at any level, then this is your responsibility as well as a survival necessity.(如果您是某个层级技术的经理，那么这是您的职责，也是您赖以生存的必需品。)
The fund-raising ability is largely a product of experience and necessity.(筹集资金的能力在很大程度上是经验和必要性的产物。)
This is, of necessity , a brief and incomplete account.(这必然是一份简略的、不完全的描述。)
Mostly they climb as a necessity to make money.(他们大多把登山当作赚钱的必经之路。)
We were discussing the necessity of employing more staff.(我们在讨论是否需要雇用更多员工。)
Necessity will force the swift adoption of more efficient ones.(需求将迫使我们迅速采取更有效的措施。)
