/ˈeldɪst/ n.年龄最大的人；最年长的人
the eldest老大
He's the eldest.他是老大。
The two eldest are already doing well at Kings Wood.年纪最长的两个现在已经在金斯伍德上学, 成绩都不错。
the eldest of sb/sth…中最年长的
David was the eldest of three boys.戴维是三个男孩中年龄最大的一个。
their eldest
(eldest child)他们最大的孩子
Saul, Emily's eldest, has just got married.埃米莉家的老大索尔刚刚结了婚。