activity
/ækˈtɪvətɪ/noun
(pl. -ies)
1
- mass noun the condition in which things are happening or being done（事情发生或发展的）状况：
there has been a sustained level of activity in the economy.
经济方面一直保持着一定的活跃水平。
1.1
- busy or vigorous action or movement（忙碌或积极的）行为, 行动：
the room was a hive of activity.
房间里热闹非凡。
2
- （一般作activities）a thing that a person or group does or has done活动：
the firm's marketing activities.
公司的市场营销活动。
2.1
- a recreational pursuit or pastime娱乐休闲活动：
a range of sporting activities.
一系列体育活动。
2.2
activities
actions taken by a group in order to achieve their aims（一团体为达成目的而采取的）行动：the police were investigating communist activities.
警方正在调查共产党的活动。
3
- the degree to which something displays its characteristic property or behaviour活性：
abnormal liver enzyme activities.
异常肝酶活性。
3.1
- Chemistry a thermodynamic quantity representing the effective concentration of a particular component in a solution or other system, equal to its concentration multiplied by an activity coefficient【化】热力活性, 活度。
词源
late Middle English: from French activité or late Latin activitas, from Latin act- 'done'， from the verb agere.