Radesky cites the "still face experiment" devised by developmentalpsychologist Ed Tronick in the 1970s.
拉德斯基引用了发展心理学家埃德·特罗尼克在20世纪70年代设计的“面无表情实验”。
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In fact, according to developmentalpsychologist David Elkind, United States society tends to push children so rapidly that they begin to feel stress and pressure at a young age.