And he has a theory about early life and perfectly appropriate as far as one can tell of what pre-human form he studied.

他有一个有关早期生命的理论,一般人都会觉得很正常,他研究人类之前的生命形式没有什么不合适。

普林斯顿公开课 - 人性课程节选

We're continuing to evolve not just as a human rights concept but certainly as nations and our ethical understandings of what is appropriate.

我们在发展，不单单是人权的观念,我们的国家，道德观念,都在向前发展。

普林斯顿公开课 - 人性课程节选