There was a lot of activity in preparation for the Queen's visit.
大家都在為準備迎接女王來訪而忙碌。
Economists are concerned by the low level of economic activity.
經濟學家們都為經濟不景氣而擔憂。
There was a sudden flurry of activity when the director walked in.
經理一走進來,大家馬上一片手忙腳亂。