许多青少年在这个阶段会经历情绪波动。

Many ___adolescents experience mood swings during this stage.

青少年时期是人生中充满变化和挑战的阶段。

___Adolescents often face many changes and challenges during this important stage of life.

青少年的睡眠模式与成年人有很大不同。

___Adolescent sleep patterns differ significantly from those of adults.