That is why scientists today wonder at the depth of his knowledge and the strength of his arguments.

VOA: special.2009.02.25

Every single thing that we discuss here could be pursued at greater depth.

每一件我们在这讨论的,都有可能到一个更深的境界。

耶鲁公开课 - 死亡课程节选

"The in-depth discussions we are having, where we are testing our assumptions, where we are looking at how better to integrate our civilian and military components and our very clear understanding that Pakistan and the region must be addressed as well, is leading to some welcome clarity and the kind of commitment that is needed,"

VOA: standard.2009.10.12