We were discussing the necessity of employing more staff.
我们在讨论是否需要雇用更多员工。
Air-conditioning is an absolute necessity in this climate.
这样的气候绝对需要有空调。
Most women, like men, work from economic necessity
与男人一样，大部分女人也是出于经济原因而工作。
Water is a basic necessity of life.
生命离不开水。
The population failed to understand the necessity for the war to go on.
人们不能理解那场战争再继续下去有什么必要。