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。 did是什么时态的标志词 achieve的形容词形式 |