/ækˈtɪv.ə.t̬i/
名词
活跃；繁忙；热闹
Economists are concerned by the low level of economic activity.
经济学家们为经济不景气而担忧。
行动；活动
He was found guilty of terrorist activity.
他因从事恐怖主义活动而被判有罪。
（尤指有组织的）娱乐活动
想跟读，去练习
