很多年轻人在青少年时期开始对音乐产生兴趣。

Many young people develop an interest in music during their ___mid-teens.

大多数青少年在15到17岁之间开始对驾驶产生兴趣。

Most teenagers start showing interest in driving during their ___mid-teens.

这个手机应用专为15到17岁的青少年设计。

This mobile app is designed for ___mid-teens aged 15 to 17.