马里兰大学巴尔的摩分校的生态学家艾勒·艾丽斯(ErleEllis)研究表明，现在地球上的大部分生态系统都反应了人类的活动。
According to studies by Erle Ellis, an ecologist at the University of Maryland, Baltimore County, the vast majority of ecosystems on the planet now reflect the presence of people.
马里兰大学巴尔的摩分校的生态学家艾勒·艾丽斯(ErleEllis)研究表明，现在地球上的大部分生态系统都反应了人类的活动。
According to studies by Erle Ellis, an ecologist at the University of Maryland, Baltimore County, the vast majority of ecosystems on the planet now reflect the presence of people.
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