activity
英 [ækˈtɪvəti]   美 [ækˈtɪvəti]  
n.
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

例句

The streets were noisy and full of activity.

街上熙熙攘攘，车水马龙。

The club provides a wide variety of activities including tennis, swimming and squash.

这家俱乐部的活动丰富多彩，诸如网球、游泳、壁球等。