"It is not perfect, but then there is no country that has a perfect system."

VOA: standard.2009.09.24

The number three is not a physical object, perfect roundness is not a physical object, perfect goodness is not a physical object.

数字三不是一个物理实体,正圆不是一个物理实体,真正的善良不是一个物理实体

耶鲁公开课 - 死亡课程节选

Not with this girl, this girl is perfect. But in the past, I've had lots of problems with roommates.

和这个女孩没吵过，她太完美了。但在过去，我和室友之间存在很多问题。

布鲁克林的房价 - SpeakingMax英语口语达人

I still think everything is not perfect in our mortgage situation in the U.S., and the dollar is rallying, but that's a bad thing right now.

VOA: standard.2010.05.21

And as a result we can look at those factors and think about what is the perfect situation for making somebody do something like this and the perfect situation not to.

所以我们可以根据这些因素,想出什么样的情况,最有可能让你电死一个人,什么样的情况最不可能让你电死一个人。

耶鲁公开课 - 心理学导论课程节选

It's not perfect, but it is there.

虽不完善，但聊胜于无。

耶鲁公开课 - 金融市场课程节选

Perfect roundness is not a physical object.

正圆也不是

耶鲁公开课 - 死亡课程节选

So whatever perfect justice is, it's not one more thing in the empirical world.

所以无论完美的正义是什么,它不存在于经验世界中

耶鲁公开课 - 死亡课程节选