a full-grown boy

• 成熟的男孩

a full-grown boy的用法和样例：

例句

1. The ingenious boy made a radio set for himself.
   这个聪明的男孩自己做了一台收音机。
2. The rough boy has been civilized by his adopters.
   那个粗野的男孩在养父母的影响下变得文雅了。