等级不够的英文：
rank deficiency
n. 排；等级；军衔；队列；行列
v. 排列；把…分等；列为；列队
adj. 讨厌的；恶臭的；繁茂的
formation; rank
队形
He rose from the rank of captain to the rank of general.
他从上尉升到将军。
Your rank is next to mine.
你的排名居于我之后。
To reduce in rank;demote.
使降职，使…降级
a man of rank in the ancien regime.
社会政治制度中人的等级。
n. 缺乏，不足，短缺，缺点；缺陷
Deficiency in vitamins/Vitamin deficiency can lead to illness.
身体缺乏维生素就会生病.
His education is deficient.
他缺乏教养。
Scurvy (or vitamin C deficiency)：Nutritional disorder caused by deficiency of vitamin C.
坏血病(亦称维生素C缺乏病):因维生素C缺乏而引起的营养性疾病。
Micronutrient deficiencies are also common in this region.
微量营养素缺乏在这一地区也很普遍。
Vitamin deficiency can lead to illness.
身体缺乏维生素就会生病。