They limited their search to mammals, whose bodies work much like humans' do-and, specifically, to those mammals living with or around people in the rich world.
他们把搜索锁定在哺乳动物上，因为哺乳动物的身体跟人类的身体功能非常相似——而且特别把搜索锁定在那些富裕国家里与人共同生活或在人周边生活的哺乳动物上。
Specifically, the frontal lobes, which are the seat in modern humans of higher cognitive functions such as abstract reasoning.
特别是大脑前庭部分，它使现代人具有较高的认知能力—例如抽象推理的能力。
They limited their search to mammals, whose bodies work much like humans' do—and, specifically, to those mammals living with or around people in the rich world.
他们将研究对象限定为哺乳类动物，因为它们的身体运作和人类十分相似，而且规定这些研究对象是生活在有钱人身边或周围的哺乳动物。
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