deficiency

lack of an adequate quantity or number

数量不足，数量不足

the inadequacy of unemployment benefits

失业救济金不足

insufficiency

inadequacy

the state of needing something that is absent or unavailable

需要缺少或不可用的东西的状态

there is a serious lack of insight into the problem

对这个问题缺乏深刻的认识

water is the critical deficiency in desert regions

沙漠地区缺水严重

for want of a nail the shoe was lost

因为缺少钉子，鞋子丢了

lack

want