我们经常会有这样的感受：在温度一样的时候，有风的天气比无风的要冷一些。这似乎是一个再平常不过的现象了，但是你知道真正的原因吗？就让下面这篇文章来为你解答吧。

Anyone who's been outside on a windy, winter day knows it's a lot more difficult to stay warm than on a calm day with the same temperature.

On a calm winter day, our bodies warm up a thin layer of air close to our skin -- called the boundary layer -- and that helps to insulate us from the cold air. However, when the wind starts to blow, it strips away this boundary layer and our skin is more exposed to the cold air.

Because wind chill speeds up the rate at which your body loses heat, it can be dangerous. Each year in Canada, more than 80 people die from overexposure to the cold.

（北京林业大学通讯员邢元媛供稿 英语点津 Annabel 编辑）