研究发现在有更多阳光以及维生素D水平高的地区，MS的病例要比较少阳光的地区更少。
Research has shown in regions where there is more sunlight and vitamin D levels are higher, there are fewer cases of MS than in those with less sunlight.
研究发现在有更多阳光以及维生素D水平高的地区，MS的病例要比较少阳光的地区更少。
Research has shown in regions where there is more sunlight and vitamin D levels are higher, there are fewer cases of MS than in those with less sunlight.
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