"There is no perfect contraceptive method, so there will always be abortion."

VOA: standard.2010.06.24

The body theorist should say, The key to personal identity is having the same body, to wit,the same brain,to wit,enough of the brain to keep the personality going-- provided that there's no branching,no splitting,no perfect competitors,only one.

肉体主义者能说，个人认同感的关键就是拥有肉体，也就是说拥有足够支持人格继续的大脑-,在没有分支，分裂以及竞争者的前提下。

耶鲁公开课 - 死亡课程节选

And what that corresponds to, if you recall, is the idea that in a perfect crystal at zero degrees Kelvin then you have no disorder at all.

如果你们能回忆起来的的话，这就意味着,绝对零度下的完美晶体,一点无序状态也没有。

麻省理工公开课 - 热力学与动力学课程节选

She says she liked its perfect world with no disease, no discrimination and a very orderly government.

VOA: special.2009.06.05

If you have imperfect competition, it's somewhere between perfect competition and no competition.

如果你们想得到不完全竞争的局面,它就在完全竞争和垄断之间

耶鲁公开课 - 博弈论课程节选

The landing was perfect. Enos suffered no bad effects.

VOA: special.2009.06.17

It could no longer be said that the moon was perfect.

没人能再说月亮是完美无缺的了。

耶鲁公开课 - 弥尔顿课程节选

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

VOA: standard.2009.09.24

Maybe you don't control thermostats in your dorm room, some of you do and some of you don't probably, and maybe it doesn't work very well so it might not be a good example, but imagine a perfect thermostat that you set for a temperature and then the temperature stays the same inside the room no matter what the temperature is outside.

可能你根本就不理卧室里的恒温器,有些人去调它,有些人就置之不理,可能它压根就是坏的,所以这个例子也许并不恰当,但你还是想象一个完美运行的恒温器,你设定温度后房间里的温度就保持不变,不管外面温度是多少

耶鲁公开课 - 生物医学工程探索课程节选

Or they have no winter sports tradition,like Peru, But Jamaican, Kenyan and Peruvian winter Olympic hopefuls have found the perfect snowy training ground in the American West.

VOA: standard.2010.01.22

We know that it has to be equal to less than 2, because even if we had absolutely no shielding at 2 all, the highest z effective we could have is 2, so it makes perfect sense that we have a z effective that falls somewhere in the middle of those two.

我们知道它必须小于，因为即使完全没有一点屏蔽,最高的有效的z是，所以我们得到的有效电荷量处于,两者之间就非常讲得通了,让我们来看看另一个例子。

麻省理工公开课 - 化学原理课程节选

That's what we responded to. So to me,no adaptation can ever be perfect.

VOA: standard.2010.01.08

Let me disclaim, too, we're by no means perfect so the Harvard courses APP that a lot of you used on the web to shop for courses, we recently sent out a form to get feedback from everyone because we don't doubt that it was imperfect the first time around, but we're going to iterate and make amends with that.

我不是说，我不是说要完美,你们大部分使用哈佛大学课程APP来在网上选课,我们最近给你们发了一个表单，从你们那里,得到反馈，因为我不怀疑,第一次时它是有瑕疵的,但是我们将反复地道歉。

哈佛公开课 - 计算机科学课程节选