另一位专家在接受公共广播公司采访时说：“很多人不明白，在人类文化和文明的演化过程中，犬类起了多么重要的作用。”
Another expert interviewed in the PBS program says, "I don't think people realize how much having dogs around has affected the evolution of human culture and civilization."
另一位专家在接受公共广播公司采访时说：“很多人不明白，在人类文化和文明的演化过程中，犬类起了多么重要的作用。”
"Another expert interviewed in the PBS program says," I don't think people realize how much having dogs around has affected the evolution of human culture and civilization.
很显然，文化也在不断发生演化，但利用生物进化领域正式且严谨的科学手段很难去研究文化的进化。
Cultural evolution clearly happens, but it's difficult to study with the formal rigor of biological evolution.
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