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。
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。
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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