1. 缺乏，不足，缺少，短缺，欠缺
2. 缺陷，缺点，不足之处
3. 不足的数额，不足额
4. 亏空，亏损，赤字
5. 缺乏症状

1. [U][C]缺乏,不足,短缺 the quality of being deficient; lack

1. the state of needing something that is absent or unavailable;

   "there is a serious lack of insight into the problem"
   "water is the critical deficiency in desert regions"
   "for want of a nail the shoe was lost"
   

2. lack of an adequate quantity or number;

   "the inadequacy of unemployment benefits"
   

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.

deficiency的解释

e.g. They did blood tests on him for signs of vitamindeficiency...
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
Adeficiency that someone or something has is a weakness or imperfection in them.

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

1. 缺陷：港务监督根据国际公约对进港船舶进行港口国安全检查(PSC)时,发现缺陷(deficiency)责令限期纠正(TO BE RECTIFIED)的,常常需要在当地安排修理和修理后检验.

2. 缺乏：其实身边也不缺乏(deficiency)对自己好的男人! 可我总是会不满足! 也许是贪心吧! 谁不是有了好的还想有更好的呢? 我也觉得自己那是不知足! 人们常说:知足者常乐! 可我并不是真的快乐(pleasure)(pleasure)!我想别人也是一样吧!

3. 缺失：26缺失(deficiency)导致染色体末端无着丝粒染色体区段、染色单体区段,或亚染色单体区段的丢失,以及这一染色体区段所含有的遗传信息的丢失,所产生的一种染色体结构变异.