"Twenty percent of attacks were improved on placebo,which is air, and 78 percent of attacks were improved on oxygen, a clear difference in favor of oxygen,"

VOA: standard.2009.12.17

It's not clear that's even a sensible question The question is there's a height difference between you and me and him and her ? How do we explain that difference?

这问题还并不一定成立,问题是身高差异存在于,你、我、他之间,这如何解释？

耶鲁公开课 - 心理学导论课程节选

Exactly how the differences in bacteria might make vaginally born babies less prone to allergies and asthma isn't yet clear, but it does point to a difference that researchers can look at going forward.

VOA: standard.2010.06.30