In two-thousand three, American William Ruddiman first proposed that global warming resulted from human activities thousands of years ago.

VOA: special.2011.04.26

Over the last couple of years, we can get reasonable measurements of human activities that were hidden from us.

在过去的几年中，人类能够通过适当的方式去测量人的大脑,在以前我们根本无法做到。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

of course you want to do some club activities too because you're human, so.

当然你还想参加俱乐部活动，因为你是人嘛，就这样。

苦中有乐的学习 - SpeakingMax英语口语达人

Human activities are producing increased amounts of carbon dioxide and other gases.

VOA: special.2010.01.19

And just as there are innumerable human activities which require undistorted references if they are to be satisfied, so there are innumerable other human activities not less important which equally require distorted references or, more plainly, fictions.

就像无数的人类活动,需要真实的证据,如果要达到令人满意的效果，无数同等重要的,人类活动,也同样需要失真的参考,说得更明白点，就是需要虚构。

耶鲁公开课 - 文学理论导论课程节选

Are climate changes real? If so,were human activities mainly to blame?

VOA: special.2010.01.19

However,human activities are threatening the world's coral reefs.

VOA: special.2010.08.10

"The majority of turtles are actually killed out of human activities."

VOA: standard.2010.07.15

They also attract unscrupulous people who engage in nefarious activities, including child labor, human trafficking and abuse of commercial sex workers.

VOA: standard.2010.05.29

"Naturally,one would be concerned because with the likes of prostitutes that will be coming over, so people are bound to be more exposed to such activities such as prostitution and human trafficking."

VOA: standard.2010.05.29