When Barbie hit shelves in 1959, the box described her as a “teen age fashion model.”

1959 年，当芭比娃娃上架时，包装盒上将她描述为 " 十几岁的时尚模特" 。

The research was based on an examination of medical records of more than 432,000 kids and teens, ages 2 to 19.

这项研究的基础是对432000多名2至19岁儿童和青少年医疗记录的检查。

Now, it's no secret that teens ages 13 to 18 are more prone to risk-taking than children or adults, but what makes them so daring?

现在，13 至 18 岁的青少年比儿童或成人更容易冒险，这已不是什么秘密，但是是什么让他们如此大胆？