缺陷血清恢复因子的英文：
DSRF, deficient serum restoring factor
adj. 不足的，有缺陷的
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。
n. （免疫）血清；浆液
serum cholinesterase activity
血液胆碱脂酶活性
Therapeutic serum levels remain undefined.
治疗血药浓度尚无定论。
When was the last time you took the serum?
你上一次注射血清是什么时候？