Some aquaculture critics doubt that aquaculture can keep growing at the current rate.

VOA: special.2011.02.08

No doubt at some point I'll fall behind.

毫无疑问，某些方面我会落后。

耶鲁公开课 - 死亡课程节选

Some people say they eat human flesh at these dinners, but you doubt that because for some reason they seem to be all vegetarians.

有人说他们吃人肉，但你不太相信,因为他们看着像是素食者。

耶鲁公开课 - 新约课程节选

The target pledges by the world's top-two carbon emitters are seen as hopeful signs for progress at Copenhagen, although a final package for global greenhouse gas reduction remains in doubt.

VOA: standard.2009.11.26

The guiding thread of the book is the correspondence, and we will look at this in some length and you will discuss it in your sections, no doubt.

本书的导引线索是,当中的相似之处，我们会读到相当篇幅,你们也会毫无疑问地在之后进行讨论。

耶鲁公开课 - 政治哲学导论课程节选

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

At first there was doubt and controversy, which has completely gone away, as more and more examples of this writing have become available and scholars are now able, by and large, to be confident that they know what these things say.

开始的时候还充斥着质疑的声音,而现在已经无可争议,因为已经有,越来越多这样的文字出土,学者们现在,对辨认出这些东西的含义,相当有自信了

耶鲁公开课 - 古希腊历史简介课程节选