很多青少年注意到，当他们进入青春期，在他们的腋下和身体的其它一些地方会有一股新的味道，而且那味道并不好闻。
A lot of teens notice that they have a new smell under their arms and elsewhere on their bodies when they enter puberty, and it's not a pretty one.
尤其，科学家们了解到很多有关青少年脑部神经生物学的知识，以及在青春期接触毒品和酒精的危险。
In particular, scientists understand much more about the neurobiology of the teenage brain and the risks of experimenting with drugs and alcohol during adolescence.
青少年充满着困惑，主要是因为青春期给他们的身体带来了骤然的改变。
Teenagers are a confused lot, mainly because of the sudden changes that puberty brings to their body.
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