... motion and time study 动作与时间研究 ; 动作时间研究 ; 动作和时间研究 ; 而正式成为工时学 Motion-time study 工时学 effects of motion study 动作研究效果 ...
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The Motion Picture Association of America is already working on its own economic study of the harmful effects of file sharing, to be completed this autumn.
ECONOMIST: The good and bad of internet file-sharing
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