Definition: when a lot of things are happening or people are moving around Level: B2
官员们对经济活动的低水平感到担忧。
Officials are concerned by the low level of economic ___activity.
房间的另一边有很多活动。
There was a lot of ___activity the other side of the room.
技术进步和工业活动正在引起很多问题。
Technical progress and industrial ___activity are causing a lot of problems.
