eldest

最年长的；年事最高的（old的最高级）英释中释adjthe eldest of a group of people, especially brothers and sisters, is the one who was born first

最年长者中释n

1 eldest son,长子；年龄最大的儿子

2 eldest brother,长兄

3 eldest daughter,长女

4 eldest sister,长姊，大姐

1 He was the eldest of six children..六个孩子当中他是老大。