"Now if that GM potato is effective and works then the environmental impact will be substantially less because the chemicals are not being used and there will be less fossil fuel use."

VOA: standard.2009.10.21

This is something I used to announce near the end, but then some people felt that it's not fair not to know this from the beginning.

这些话我以前都是在期末的时候说的,但后来有些同学反映,如果不在课程一开始知道这些会很不公平

耶鲁公开课 - 基础物理课程节选

"When you can't say for sure whether all the women in the advance provision group actually used the medication, then you're kind of looking at population level effect of a strategy, not the individual effect of a medication."

VOA: standard.2010.03.22

"We're talking about the livelihoods of millions of people but we're also talking about a huge potential resource of hydropower which can not only provide foreign revenues to the countries, but can those revenues can then be used to finance other development programs and help countries meet their targets on poverty alleviation and millenium development goals,".

VOA: standard.2010.01.11