time-and-motion study

noun
🔊/ˌtaɪm ən ˈməʊʃn stʌdi/
🔊/ˌtaɪm ən ˈməʊʃn stʌdi/
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  1. a study to find out how efficient a company’s working methods are时间与动作研究(为评估生产或工作效率)