Professor Bartemeus says the study shows how human activities in the natural environment can change the travels of other organisms.

VOA: special.2010.03.02

And I want to share with you couple of studies-- I'll share one study and then another later-- about the environment.

我想介绍两个研究-,先说第一个再说第二个，关于环境。

哈佛公开课 - 幸福课课程节选