being active or lively
specific thing or things done; action; occupation
"they avoided all recreational activity"
"his sphere of activity"
"he is out of action"
"respiratory activity"
"catalytic activity"
"the action of natural forces"
"volcanic activity"
"the level of activity declines with age"
A regrettable by-product of their activities.
出自: H. W. Fowler
The widespread activities of the state security police.
出自:Listener