Sunscreens that use metallic compounds, such as titanium oxide or zinc oxide, to block, rather than absorb ultraviolet light may be the most effective when spending time outdoors.

• 户外活动时使用金属化合物，如二氧化钛或氧化锌，以阻止紫外线，而不是吸收紫外线可能是最有效的。