verb, measure word, adjective, noun · an organized social activity, campaign, or maneuver

学校准备下周举办一次大型户外活动。

verb · systemic phenomena or occurrences (such as seismic or economic activity)

地质学家监测到了频繁的火山活动。

verb · to perform physical movements or show signs of life; to function or be in operation

蝙蝠在夜间活动。

verb · to exercise, move about, or work out physically

他每天早上都要去公园活动一下筋骨。

adjective · movable, flexible, or not fixed (such as capital or scheduling)

我们的会议时间很活动，可以根据大家的需要调整。

verb · to use personal influence, connections, or bribes to achieve a goal

他正为升职的事四处活动。

verb · shaky, loose, or unsteady in position

这颗牙齿松了，已经有点活动了。