firstborn
n. 长子；初生儿；长女
adj. 头生的；第一胎生的
例句
She was my firstborn.
她是我的长女。
《柯林斯英汉双解大词典》
Firstborn sons received preferential treatment.
长子们受到了优等待遇。
A careful reading of the text reveals that most of the firstborn children in the sample were from single-parent homes in which the father was absent.
仔细阅读文本就会发现，样本中大多数头生子女都来自没有父亲的单亲家庭。
