Adolescence is a time full of changes and challenges.

青春期是一个充满变化和挑战的时期。

Late spring, in the Cretaceous Period. Adolescence is a critical time.

白垩纪，暮春时节。青春期是一个关键时期。

This is hardly surprising given that adolescence is a period of change in which many people find who they are and what they want for themselves in adult life.

这不那么令人吃惊，因为青春期是一个转变的阶段，在这个阶段很多人发现自己是谁，成年生活里他们想要什么。

Adolescence is a critical period for emotional development.

青春期是情感发展的关键时期。

There is strong evidence that excessive exposure to UV radiation during childhood and adolescence is a risk factor for developing skin cancer later in life.

有大宗的原料显示，在童年和期接触也许露在紫外线下会为以先生中繁荣皮肤癌的一个危险分。

There is strong evidence that excessive exposure to UV radiation during childhood and adolescence is a risk factor for developing skin cancer later in life4.

有大批的原料显示，在童年和期接触或许揭穿在紫外线下会为以先生中开展皮肤癌的一个危险身分。