zài / zhè / qún / hái / zi / zhōng / Xiǎo / Míng / nián / jì / zuì / dà / yǎn / rán / chéng / le / hái / zi / tóu

在这群孩子中，小明年纪最大，俨然成了孩子头。

Among these children, Xiaoming is the oldest and has naturally become their leader.