Tourism, as an activity of human social life, has long history.

旅游作为人类社会生活的一项活动，有着悠久的历史。

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As an unique social activity of human being, it includes subject, object and medium.

作为人类特有的社会活动，它包含主体、客体和中介三个要素。

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So we have been talking about theories that deal with the effects of human activity on the climate.

所以我们一直在讨论人类活动对气候影响的理论。

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Scientists say climate change and human activity have increasingly led to the melting of massive pieces of Antarctic ice.

VOA: special.2009.04.22

We will be able to actually measure the activity of the human brain.

将来，我们还能够测量人类大脑的活动。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

The regime for him is not one branch of human activity among others it is the fundamental principle or ordering principle that makes all the others even possible.

对他而言,政体并非人类活动的一个分支,而是基本的原则,或说是指导原则,使所有其它学科化作可能,这就是为何。

耶鲁公开课 - 政治哲学导论课程节选

My paintings and installations are mostly about the bycatch of human activity and the race for technological progress in combination with the human error that surrounds this progress.

FORBES: A Dead Cat Flies. But Is It Art?

The four kilometers on either side of the border are crisscrossed only by small animals, and the absence of any human activity creates a false sense of calm.

WSJ: Michael Auslin: The Mirage of Peace in the DMZ

Across all of Africa the impact of human activity is clear - whether in the newly irrigated areas created by the waters of the Nile, turning huge areas of the desert around Egypt's lake Nasser green, or the urban sprawl of Dakar, across the Cap Vert peninsula in Senegal.

BBC: Atlas shows vanishing landscape