congenital disorder consisting of an inability to digest milk and milk products; absence or deficiency of lactase results in an inability to hydrolyze lactose
双语例句
Aren't most Chinese sensitive to undigested lactose? 难道大多数中国人不是乳糖不耐受的吗？
Congenital lactose intolerance is very rare and is an inherited metabolic disorder rather than an allergy. 先天性的乳糖不耐受是非常罕见的遗传性的代谢紊乱，而并非过敏。
