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单语范例（未经PONS编辑处理）
Most fish are unable to regulate the amount of light that enters the eye since they have irises that can not change size.
en.wikipedia.org The human iris can be seen in a number of various colors.
en.wikipedia.org Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin.
en.wikipedia.org The top half of the iris is pale and the bottom half dark.
en.wikipedia.org The iris is brown and legs are black.
en.wikipedia.org