But climate change skeptics have seized on the recent theft of thousands of private e-mail messages from computer servers at a British climate research center to cast doubt on whether global warming is as serious as it has been made out to be.

VOA: standard.2009.12.09

You kind of doubt whether vegetarians would eat human flesh.

你不相信素食者会吃人肉。

耶鲁公开课 - 新约课程节选

.. You mentioned earlier that you doubt... you have questions about whether this high rate of growth is sustainable?

您之前提到过您怀疑。,您质疑印度经济的高增长率,能否保持下去？

普林斯顿公开课 - 国际座谈会课程节选