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单语范例（未经PONS编辑处理）
However, higher order primates also have a sense of reciprocity and fairness.
en.wikipedia.org Reciprocity, by contrast, speaks directly to both sides of the equation requiring responses in kind: positive for positive, negative for negative.
en.wikipedia.org There are also contrasting ideas when it comes to the differentiation of negative and positive norms of reciprocity.
en.wikipedia.org Reciprocity failure generally becomes significant at exposures of longer than about 1 sec for film, and above 30 sec for paper.
en.wikipedia.org With chemical films, reciprocity between aperture and exposure settings starts to break down at low light levels.
en.wikipedia.org