它们的工作原理要么是含有能吸收紫外线的化学物质，要么是使紫外线折射或色散，避开你的身体。
They work by either chemically absorbing UV rays or deflecting and bouncing them off your body.
当来自太阳的紫外线轰击到莴笋时，莴笋叶子就会在外层细胞创造吸收紫外线的多酚类物质。
When bombarded with ultraviolet rays from the sun, the lettuce leaf creates UV-absorbing polyphenolic compounds in its outer layer of cells.
当来自太阳的紫外线轰击到莴笋时，莴笋叶子就会在外层细胞创造吸收紫外线的多酚类物质。
When bombarded with ultraviolet rays from the sun, the lettuce leaf creates UV-absorbing polyphenolic compounds in its outer layer of cells.
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