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来源:雅诚德英语网
In another set of experiments, Kramer put identical food boxes around the cage, with food in only one of the boxes.
在另外一组实验中,克雷默在鸟笼周围放置了完全相同的食盒,这些食盒中只有一个食盒有食物。
In another set of experiments, Kramer put identical food boxes around the cage, with food in only one of the boxes.
在另外一组实验中,克雷默在鸟笼周围放置了完全相同的食盒,这些食盒中只有一个食盒有食物。