1、During adolescency, teenagers often experience significant physical and emotional changes.
青春期期间，青少年常常经历明显的身体和情绪上的变化。

2、Adolescency is a critical stage of development where individuals transition from childhood to adulthood.
青春期是一个关键的发展阶段，个体在这个阶段从儿童过渡到成年人。