The change of roles comes from the rapid development of society and technology, says Zhou Xiaohong, a sociology professor from Nanjing University.

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。

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Xia Xueluan, a sociology professor at Peking University, said: "it is an era of reading pictures from magazine or websites."

北京大学社会学教授夏学銮说：“现在是个读图时代。”

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The sociology professor said marital satisfaction decreases after the birth of the first child and continually decreases over time.

这位社会学教授表示，在第一个孩子出生后，婚姻满意度将会下降，并随着时间的推移不断下降。

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That was the finding of sociology professor David Phillips at the University of California, San Diego, and his student Gwendolyn Barker.

VOA: special.2010.06.16

David Phillips is a sociology professor with the University of California at San Diego.

VOA: special.2010.07.13

Masibulele Yaso is a 28-year-old sociology professor from the South Africa's Eastern Cape region.

VOA: standard.2009.07.01

Her mother, sociology professor Dolores Pereira Coutinho, 50, campaigned for months before taking legal action.

BBC: Brazil judge orders Facebook memorial page removed

China Daily newspaper quoted Nanjing University sociology professor Zhu Li saying Zheng's attack inspired copycats.

CNN: Schools in China prepare for copycat attacks

"This 'wailing wall' just makes me suffer too much, " Juliana's mother, sociology professor Dolores Pereira Coutinho, earlier told the BBC.

BBC: Facebook removes memorial page of Brazilian journalist