来自南京大学的社会学教授周晓红说，这种角色的转变来自社会和科技的快速发展。
The change of roles comes from the rapid development of society and technology, says Zhou Xiaohong, a sociology professor from Nanjing University.
这些变化为哺乳动物角色的转变奠定了基础。
These changes appear to prepare the animals for their new roles.
第二部分：数学教师角色的转变。
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