已知的是，二苯甲酰甲烷及其衍生物对紫外辐 射相对敏感，且它们在日光作用下迅速分解。
It is known that dibenzoylmethane and its derivatives are relatively sensitive to ultraviolet radiation and they decompose rapidly under the effect of sunlight.
太阳能电池板只能在日光下起作用。
我将这次探索的结果称为日光图，在于借着光的作用自发再现。
The discovery I have made and which I call Heliography, consists in reproducing spontaneously, by the action of light.
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