the offspring who came first in the order of birth
形容词 firstborn:
first in order of birth
例句
用作形容词 (adj.)
But the first, a leadoff double by Jeter, sparked the only rally the Yankees needed. 这是王今年最长的一场先发,他不停的进步著,努力终于有了代价。
The skin color of the indigenous people of Africa has had the longest time to adapt because anatomically modern humans first evolved there. 非洲原住民的肤色有最长的时间适应,因为现代智人是在非洲演化出来的。