productivityn.
英 prɒdʌk'tɪvɪtɪ | 美 ,prodʌk'tɪvəti
中文n. 生产力；生产率；生产能力
词根词源
productivity (n.)1809, "quality of being productive," from productive + -ity. An earlier word for this was productiveness (1727). Economic sense of "rate of output per unit" is from 1899.
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