adj.发育不全的；不发达的
动词underdevelop的过去式和过去分词.
He had underdeveloped lungs, like a premature baby. 它像一个早产的婴儿，肺部发育不全。
In rare cases, these organs are underdeveloped or missing. 在罕见的案例里，这些器官发育不良或缺乏。
Lumbering is very important in some underdeveloped countries. 在一些不发达的国家，伐木业十分重要。
