名詞 deficiency:

1. the state of needing something that is absent or unavailable
   同義詞：lack, want
2. lack of an adequate quantity or number
   同義詞：insufficiency, inadequacy

1. The deficiency of this plan is very clear and it can't possibly succeed.
   這項(xiàng)計(jì)劃的缺陷是很明顯的，它不可能成功。
2. I have a slight calcium deficiency.
   我有點(diǎn)缺鈣。

de.fi.cien.cy

n.（名詞）
【復(fù)數(shù)】 de.fi.cien.cies
The quality or condition of being deficient; incompleteness or inadequacy.
缺點(diǎn)，缺陷：不完善的性質(zhì)或狀況；不完整或不充足
A lack or shortage, especially of something essential to health; an insufficiency:
缺乏，缺少：不足，尤指對(duì)健康十分必需的東西；不夠：
例句：
a nutritional deficiency.
營(yíng)養(yǎng)缺乏