英汉词典

1. （尤指身体所需物质的）缺乏，缺少，不足
    Deficiency in something, especially something that your body needs, is not having enough of it.

    e.g. They did blood tests on him for signs of vitamin deficiency...
           他们给他验了血，以检查是否有维生素缺乏的迹象。
    e.g. There are serious deficiencies in the numbers of suitable aircraft.
           符合要求的飞机数量严重不足。

2. 缺点;缺陷;瑕疵
    A deficiency that someone or something has is a weakness or imperfection in them.

deficiency

    e.g. ...a serious deficiency in our air defence.
           我们在空防上的严重缺陷