deficiency/deficient

deficiency /diˈfiʃənsi/ n. ［c］ 1.缺点，不足：suffer from a deficiency of food 受食物的不足之苦 There was a deficiency of vitamin C. 缺乏维生素C。2.缺点，缺陷：the deficiency of nature 自然缺陷 The deficiencies in this plan are clear. 该计划的缺点是显而易见的。

deficient /diˈfiʃənt/ adj. 1.缺乏的，不足的：The milk is deficient in fat.这牛奶脂肪含量不足。A diet deficient in vitamin D may cause the disease rickets.缺少维生素D的饮食可能导致软骨病。2. 有缺点的，有缺陷的：An educational system which fails to teach basic arithmetic is seriously deficient.一个沒教基础算术知识的教育体制是有严重缺陷的。