Even if you are not prepared to work up a sweat three times a week, any activity is better than none.

即使你不准备1周流3次汗，任何活动总比没有要好。

《柯林斯英汉双解大词典》

When the speeches start, all activity must stop in tile restaurant, so that the three people giving them can be heard.

发言开始后，餐厅内其余所有活动都要停下，这样大家才能听见那三位演讲者说话。

youdao

School students should have at least three hours of active physical activity each week.

学生每周至少应该有三个小时的体育活动。

youdao

These studies must consider wildlife activity up to about three thousand meters above an airport and eight kilometers around it.

VOA: special.2009.04.01

A city report says economic activity last year totaled almost three billion dollars, a four percent decrease from two thousand seven.

VOA: special.2009.03.30

A report from last year said women business owners are responsible for three trillion dollars a year in economic activity.

VOA: special.2010.04.23

These recommendations include at least 60 minutes of moderate-intensity aerobic exercise a day, such as brisk walking, plus high intensity activity three times a week.

WSJ: Kids With Asthma Play Hard, Too

In fact what happened was increased activity in three areas of the frontal and parietal cortex, some of which are better known for their involvement in rational thought.

ECONOMIST: The science of religion

Of the two, only the First Progress card reports customer activity to all three credit bureaus.

FORBES: Best Credit Cards If Your Credit Is In The Doghouse