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来源：雅诚德英语网
Wing feather with copper-containing pigment, flight and display, Courtesy Peter Mullen, Ph.D.
带有铜类色素的翅羽，飞行和展示用，彼得·穆伦博士惠赠
Wing feather with copper-containing pigment, flight and display, Courtesy Peter Mullen, Ph.D.
带有铜类色素的翅羽，飞行和展示用，彼得·穆伦博士惠赠