Nowhere is not in ultraviolet ray, glazing can keep apart major UVB ultraviolet ray only, stronger to penetration and harm force UVA is held back hard.

• 紫外线无处不在，玻璃窗只能隔离大部分UVB紫外线，对于穿透力及伤害力更强的UVA则难以阻挡。