Researchers followed ethnically and racially diverse suburban and urban kids from early adolescence to early adulthood.

研究人员们从青少年初期到青年初期依照民族，城市及郊区的不同划分对孩子们进行了调查。

Note the adjective form here of the noun we had earlier adolescence.

请注意这里我们之前提到的名词青春期的形容词形式。

By early adolescence, she'd mastered philosophical debate, Latin, and the Aztec language Nahuatl.

在青春期早期，她已经掌握了拉丁语的哲学辩论，和阿兹台克人的语言——Nahuatl。

Some scientists believed that the brief window closes shortly after birth, while others stretched it only to early adolescence.

一些科学家认为短暂的语言学习窗口在出生后不久就会关闭，另一些科学家则认为这一窗口能持续到青春期早期。

From early adolescence we take great care to shield our sexual sides from others.

从青春期早期开始， 我们就非常注意保护自己的性方面不受他人影响。

But Rosemary had been a celebrity for only six months, and sometimes the French manners of her early adolescence and the democratic manners of America, these latter superimposed, made a certain confusion and let her in for just such things.

但罗斯玛丽成名才六个月，有时她青春期早期的法国礼仪和美国的民主礼仪叠加在一起，会造成一定的混乱，让她陷入这样的境地。