卡斯特拉尼说，“在约华氏零下15度（摄氏零下26.111度）的风寒温度，你会看到冻疮病例的增加。”
"It takes a wind chill temperature of around minus 15 degrees [F] where you start to see an increase in the incident of frostbite, " Castellani said.
风寒系数大，会使人觉得比实际温度更冷一些。
如果温度降到0度以下或者风寒指数达到负20，那么还是踩脚踏车吧。
If the temperature dips below zero or the wind chill is below minus 20, hit the treadmill instead.
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