She says that the goods and services provided by nature - like clean air, rain or fertile soils - should not be taken for granted.

VOA: standard.2010.02.24

Again, this probably should be cleaned up and in a couple of weeks we'll spend a day or half period trying, to clean it up and make it somewhat more precise.

以上内容还有待梳理,未来两周我们将会花上一天半左右的时间,试着梳理这些内容,使其更加精确

耶鲁公开课 - 死亡课程节选

But central to the debate going on in Britain is the very credibility of the Afghan government as more and more question whether British lives should be put at risk in support of what is seen as a less than clean Hamid Karzai government.

VOA: standard.2009.11.04