尽管玻璃可以阻挡阳光紫外线照射，可仅仅能阻止50%，剩下的依然可以穿透玻璃使皮肤老化。
Glass does block out the sun's UVB rays, but about 50 percent of UVA rays, associated with burning and aging, do get through.
尽管玻璃可以阻挡阳光紫外线照射，可仅仅能阻止50%，剩下的依然可以穿透玻璃使皮肤老化。
Glass does block out the sun's UVB rays, but about 50% of UVA rays, associated with burning and aging, do get through.
衣服可以保护皮肤免受阳光中有害的紫外线照射，不过并不是所有的衣服都可以提供这种保护。
Clothing does protect the skin against the sun's harmful ultraviolet rays, but not all clothing provides the same protection.
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