activity n. 活动；行动；活跃；

例句：

It was a period of intense activity.

那是活动激烈的时期。

Parents encourage every activity imaginable.

父母鼓励一切可能的活动。

The test records the electrical activity of the brain.

这个测试显示出大脑的电流活动。

The rehearsal studio is buzzing with lunchtime activity.

排练场被午餐时段活动搞得很热闹。

If the weather is wet or cold choose an indoor activity.

如果下雨或是天气寒冷，就选择室内活动。

Physical activity is an important factor in maintaining fitness.

体育活动是保持健康的一个重要因素。