Check the ingredient list for zinc oxide or titanium dioxide; both physically block UVA and UVB rays.

注意成分表中是否含有氧化锌或二氧化钛，这两者都能阻挡紫外线A和B。

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Methods: 328 casting of titanium dentures were studied by x-rays statistically analysed.

方法：对328件铸钛义齿进行回顾性总结，并对其发生的铸造缺陷进行统计分析。

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UTC's solution: Pass the return air through an aluminum filter sprayed with titanium dioxide that, hit with ultraviolet rays, sets off a chemical reaction that breaks down nasty organic compounds like benzene and formaldehyde into carbon dioxide and water.

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