activityn.
英 æk'tɪvɪtɪ | 美 æk'tɪviti
中文n. 活动；行动；活跃
词根词源
activity (n.)c. 1400, "active or secular life," from Old French activité, from Medieval Latin activitatem (nominative activitas), a word in Scholastic philosophy, from Latin activus (see active). Meaning "state of being active, briskness, liveliness" recorded from 1520s; that of "capacity for acting on matter" is from 1540s.
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