activity 义务阶段1500 全国卷频次:14
n. activities 19
Reading can be a social activity.
There are usually no planned activities like games at a housewarming party.
The magazine covers the choices people make about their homes, their clothes and their free time activities.
economic activity 经济活动
catalytic activity 催化活性
physical activity 身体活动，体育活动；体力活动
biological activity 生物活性
enzyme activity 酶活力
business activity 商业活动，经济活动；业务活动
social activity 社会行动
brain activity 大脑活动
sexual activity 性活动；性行为
seismic activity 地震活动；地震活动性
antimicrobial activity 抗菌活性；抗菌能力；抗微生物活性
volcanic activity 火山活动；火山活动性
electrical activity 电活动，脑电活动
enzymatic activity 酶活性；酶活力
practical activity 实践活动
solar activity 太阳活动；太阳活动性
water activity 水分活度；水分活性
marketing activity 销售活动
outdoor activity 户外活动，室外活动
activity level 活动级；活动程度
1. [U] a situation in which sth is happening or a lot of things are being done
The streets were noisy and full of activity.
Muscles contract and relax during physical activity.
⇨ compare inactivity at inactive
2. [C, usually pl.] a thing that you do for interest or pleasure, or in order to achieve a particular aim
leisure / outdoor / classroom activities
The club provides a wide variety of activities including tennis, swimming and squash.
illegal / criminal activities
1 [countable, uncountable] things that people do, especially in order to achieve a particular aim 〔尤指为达到一定目的而进行的〕活动
Everyone is free to engage in peaceful political activity.
Regular physical activity helps to control your weight.
2 [countable usually plural] something that you do because you enjoy it 〔出于爱好的〕活动
outdoor activities such as hiking or climbing
3 [uncountable] a situation in which a lot of things are happening or a lot of things are being done 活跃，热闹；活动
The office was suddenly full of frantic activity.
The farm was always a hive of activity at this time of year.
1.N-UNCOUNT 不可数名词热闹状况;活跃 Activity is a situation in which a lot of things are happening or being done.
…an extraordinary level of activity in the government bonds market.
…the electrical activity of the brain.
2.N-COUNT 可数名词活动 An activity is something that you spend time doing.
You can take part in activities from canoeing to bird watching.
3.N-PLURAL 复数名词（团体为达到某种目的而采取的）活动，行动 The activities of a group are the things that they do in order to achieve their aims.
…a jail term for terrorist activities…
On April 29, the activities of the company were suspended on the orders of the Bank of England.
[noncount] : the state of being active热闹状况；活跃的气氛
The holidays always set off a lot of activity in our home.
: behavior or actions of a particular kind活动；行动；行为
the sexual activity of married couples
The police are now monitoring criminal/gang/drug activity in the area.
There has been an increase in the city’s (level of) economic activity.
She gets at least 30 minutes of physical activity every day.
The instruments are used to detect volcanic activity on the island.
[count] : something that is done as work or for a particular purpose活动；工作— usually plural通常用复数
Grandma needs help with her everyday/daily activities.
They were accused of financing the group’s illegal activities.
[count] : something that is done for pleasure and that usually involves a group of people消遣活动；集体娱乐活动
We planned an activity for the children.
— usually plural通常用复数
The camp offers hiking, swimming, and other recreational activities.