In fact, according to a recent scientific study, overall levels of happiness decline from one's teens until one's 40s and then pick up again until they peak in one's early 70s.

事实上，据最近一项科学研究表明，所有快乐水平在少年时期至40岁之间会有所下降，而在70岁时达到顶峰。

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That's in the one decade of the teens.

迁移持续了十多年

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If anything the movie may serve to introduce a new generation to a book that is best read for the first time in one's late teens or early 20s.

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Authorities said one of the teens fired four shots, grazing West's ear and striking her in the leg, before he walked around to the stroller and shot the baby in the face.

NPR: Police Arrest 2 Teens In Georgia Baby's Killing