After a day of air and activity, you should be in the mood for a good meal.

在户外活动了一天，你应该想好好吃一顿。

《柯林斯英汉双解大词典》

Australian climatologist will Steffens argued that climate change caused by human activity will fundamentally alter the air, land and oceans for tens of thousands of years.

澳大利亚气候学家威尔·斯蒂芬斯辩称，由人类活动引起的气候变化将完全地改变数万年的空气、土壤和海洋。

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But you, dear reader, are indulging right now in activity that is equally as polluting as air travel: using a computer.

但是你，我敬爱的读者，正放纵于一项与空中旅行造成同等污染的活动：使用电脑。

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We attended this year's United States Air Guitar Championships in Washington,D.C.to learn more about this unusual activity.

VOA: special.2009.08.14

In Kirkuk mainly air activity has been going on.

CNN: Shepperd: Heat can make gear 'miserable'

Continuing cool, moist air significantly reduced fire activity and helped firefighters build containment lines around the 44-square-mile fire at the western end of the Santa Monica Mountains.

NPR: Cause Of California Wildfire Appears Accidental

To believe the government can produce prosperity simply by printing money is to believe that governments can produce economic activity out of thin air.

FORBES: Less Stimulus, More Jobs