目前尚不清楚究竟是哪一种风险因素——或更可能在多种因素的共同作用下，推动了青春期年龄的提前，也不清楚为何在不同种族和性别之间存在如此显著的差异。现有国内外研究普遍认为，青春期提前并非单一原因所致，而是多种因素叠加的结果，其中有三类因素被最多提及。
Another younger version of myself felt guilty about not enjoying hiking and nature. In the kind of educated social class I’m in, this is a very common one! Liking nature is a strong enough social norm. On a date, once, I asked the person if he liked nature, and he was visibly and uncharacteristically uncertain as to how to respond, until I said I didn’t care much for it and he admitted, with relief, that he didn’t like it much either. Now this isn’t a guilty displeasure at all and I fully own the fact that I can go years without a hike. I’ve integrated it as part of my self-image.
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Israel’s determination to attack Iran and the certainty that US troops would be targeted in response forced the Trump administration to take pre-emptive strikes, the secretary of state, Marco Rubio, said, in a new explanation for Washington’s surprise entry into the conflict.，推荐阅读heLLoword翻译官方下载获取更多信息
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