The Forest Service is protecting the area from too much human activity so it will return to its natural wild condition.

VOA: special.2009.07.20

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

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

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

VOA: special.2009.04.22

But cement manufacturing produces around five percent of the carbon dioxide released by human activity worldwide.

VOA: special.2009.12.01

Furnace Creek is the largest area of human activity within Death Valley National Park.

VOA: special.2009.08.26

Or,they say the Earth may be warming, but human activity is not responsible.

VOA: special.2010.01.19

Some estimates suggest species extinction because of human activity is about 1,000 times faster than the natural rate of loss.

VOA: standard.2010.01.31

Most scientists believe the warming trend is mainly caused by human activity, especially the use of fossil fuels and the cutting down of forests.

VOA: standard.2009.12.09

"Our relations have been transformed, and today they encompass cooperation in all areas of human activity."

VOA: standard.2009.11.25