In a park in Paris city centre, pigeons were fed by two researchers, of similar build and skin color, wearing different colored lab coats.
在巴黎市中心的一个公园里，两名体型和肤色都相似的研究人员穿着不同颜色的实验室工作服去喂一群鸽子。
In a park in Paris city center, pigeons were fed by two researchers, of similar build and skin color, wearing different colored lab coats.
在巴黎市中心的一个公园，两名研究人员喂食鸽子，这两个研究人员体格和肤色相近，但穿着不同颜色的实验室外衣。
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