"And every time I ask myself,as I do, these questions my answer is yes, we are taking the right action, the action that is necessary to safeguard both our country and promote security in the world,"

VOA: standard.2009.09.04

And the reason they're unavoidable, the reason they're inescapable is that we live some answer to these questions every day.

它们之所以无可避免，无法回避,是因为在日常生活中，我们一次次地在回答这些问题。

耶鲁公开课 - 公正课程节选

This is the goal for my first lecture today, to try to answer these questions.

今天这门课的目的是,探寻几个问题的答案

耶鲁公开课 - 生物医学工程探索课程节选