Marketing Psychology Study Series (c) Yi-yin-yin-color: What is the purpose of learning?

营销心理学研究系列（三） 贤贤易色：学问的目的是什么？

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The study was released in a series of articles published in the Lancet.

VOA: special.2009.09.08

The researchers are holding a series of study days around the country to spread the word about maggots.

BBC: Maggot cure for 'unbeatable' bug

Many groups and experts have asked that lawmakers take time to fully study the implications of the series of proposals, partly out of concern they could get caught up in the strong national desire to act swiftly and strongly in the aftermath of the attacks.

CNN: Anti-terrorism proposals worry civil libertarians

This is a finely observed study of solitude told through a series of monologues by four characters in late middle age.

ECONOMIST: The great French novel has all but vanished