仅仅因为偶然性这个解释被排除，并不能证明心灵感应一定存在；还有很多其他的方法可以得到正面的结果。

Just because chance had been ruled out as an explanation did not prove telepathy must exist; there were many other ways of getting positive results.

youdao

在我看来，虽然还没有发现，但在其他行星上一定存在生命。

In my opinion, there must be life on other planets though none has been discovered.

youdao

基于这些原因，我们可以假设在神经发育过程中一定存在一个重要的随机因素，特别是在所有正常大脑的发育过程中确实也会发生错误。

For such reasons, we can assume that there must be an important random factor in neural development, and in particular, that errors must and do occur in the development of all normal brains.

youdao

So, this observation is equivalent to saying that there must be something that is path independent.

这个表述相当于说,一定存在某个物理量是与路径无关的。

麻省理工公开课 - 热力学与动力学课程节选

That is to say, if something causes literature, there must be some sort of authority behind it and therefore we find ourselves asking, "What is an author?"

即是说，如果文学有缘由的，它的背后一定存在作者,所以我们会问，“作者是谁？“

耶鲁公开课 - 文学理论导论课程节选

It probably has some risk, but the way we approximate things in finance, we take the government as riskless.

它可能存在一定的风险，但在金融学上，我们忽略其风险，将政府债券看作无风险。

耶鲁公开课 - 金融市场课程节选