世上本没有好人；坏人的存在证明他们是好人。

There wouldn't be good people in the world; bad people exist to prove them as good.

youdao

几十年前就存在证明植物能从土壤中吸收维生素的证据了。

Evidence that plants obtain vitamins from the soil has been available for several decades.

youdao

在方程课上，我听了一系列未公开的演讲，强调的是微分方程的解的存在证明及其唯一性。

For the equations course, I was given a set of unpublished lectures that emphasized existence proofs and uniqueness of solutions to differential equations.

youdao

That they exist is a proof that American ideals are not the tawdry pretenses they are so often accused of being.

或许这类人的存在,正证明了美国式理想并非无可挑剔,或者说它也在经受着现实的折磨，“

耶鲁公开课 - 1945年后的美国小说课程节选

Now in the passage I gave you, Freud says a very interesting thing, which is that after all, we have absolutely no objective evidence that the unconscious exists.

在我发给大家的文章中，弗洛伊德说到了非常有意思的一点，那就是完全没有客观的证据,来证明潜意识的存在。

耶鲁公开课 - 文学理论导论课程节选

When I talked about arguments for the existence of a soul, I said, "Look, here's one possible argument.

当我谈论证明灵魂,存在的论证时,我说过,"这里有个可能的论证

耶鲁公开课 - 死亡课程节选