引申为名词，意思是必需品，例如：
1、For her， books were as necessary to life as bread.对她来说，书就像面包一样，是生活必需品。
2、Sugar， alcohol and tobacco， economist Adam Smith once wrote， are commodities which are nowhere necessaries of life， which have become objects of almost universal consumption， and which are， therefore， extremely popular subjects of taxation."“糖，酒和烟，”经济学家亚当·斯密曾写道，“绝不是生活的必需品，但是却成为几乎全世界人的消费品，因此，也成为了征税的绝佳对象。”
3、They were destitute of necessaries of life.他们缺少生活必需品。
