They trained one lemur to open the hinged door, then had four lemurs watch their comrade repeatedly open it and get snacks inside.
他们训练一只狐猴打开绞合门，让它四个同类在旁边观看它反复打开罐子来拿吃食。
They trained one lemur to open the hinged door, then had four lemurs watch their comrade repeatedly open it and get snacks inside.
他们训练一只狐猴打开绞合门，让它四个同类在旁边观看它反复打开罐子来拿吃食。
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