运用认识系统特性的三阶段论考察了智力理论的演化历程，并提出了智力理论演化的三阶段模型，试图以此来解释各种智力理论在逼近智力本质道路上的位置及其意义。
Then it comes to a three stages evolution model for the intelligence theory to explain all kinds of intelligence theories stage and value on the way to the nature of intelligence.
生理和演化理论都解释了这种趋势。
Physiology and evolutionary theory alike offer explanations for this tendency.
兰奇说，既然我们知道这种能力在动物界也很常见，那么科学家们应当修正关于追随视线能力演化的理论。
Now that we know it's common among animals, Range says, scientists need to revise their theories about why it evolved.
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