活跃的名词英文单词activity；
activityn.活动；热闹状况；活跃；(为兴趣、娱乐或达到一定目的而进行的)活动
The whole place was a scene of feverish activity.
整个地方都是一片紧张匆忙的`景象。
He watched the house for signs of activity.
他注视着那所房子里的动静。
Muscles contract and relax during physical activity.
身体活动时肌肉收缩放松。
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