心理学家对笑细心的研究余有十年，但是只停留在表面。
Psychologists have studied smiles carefully for decades, but.
他们起初认为参与研究的教师们“太功利……不够博学和细心，无法推动系统的反思”。
They describe the initial understanding in the teachers with whom they were working as being "utilitarian … and not rich or detailed enough to drive systematic reflection."
“这项实验实施过程很细心，安慰剂的对照结果也使研究成果很有说服力，”马修·j·埃利斯说。
"This was a very carefully conducted study, and the placebo control makes the findings quite compelling," says Matthew J.
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