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1. Oxford Dictionary

   reciprocity failure

   • n.
     deviation of an emulsion from the principle that the degree of darkening is constant for a given product of light intensity and exposure time, typically at very low or very high light intensities.

   • noun: reciprocity failure

2. • 更多解釋

   reciprocity failure

   • IPA[ˌresəˈpräsədē ˈfālyər]

   • n.
     failure of an emulsion to follow the principle that the degree of darkening is constant for a ...

   Oxford American Dictionary