人们普遍认为，具有如此高镁含量的火山岩是不可能存在的。

It was generally accepted that volcanic rocks with such high levels of magnesium could not exist.

youdao

现代大气层支持着许多复杂的生命形式，而这些生命在地球最初的大气层中是不可能存在的，因为当时的氧气含量太低。

The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth's first atmosphere because the oxygen level was too low.

youdao

这种自满的文化在二十世纪九十年代的经济风险中是不可能存在的。

That complacent culture could not survive the less sheltered economy of the 1990s.

youdao

And why is that? Within the perspective of Milton's free-will theology, sin can't exist as an external reality.

为什么呢？从弥尔顿自由意志的学说的角度来看，原罪是不可能以永久现实的形式存在的。

耶鲁公开课 - 弥尔顿课程节选

People tend to think, because the computer says it's so, it must be so. That the computer is- speaks for God. And therefore it's infallible.

那么一定就是这么回事了,他们认为计算机代表着神一样的存在-,因此是不可能犯错的。

麻省理工公开课 - 计算机科学及编程导论课程节选

That's something that only the mind can think about, that we don't actually have in the world, the empirical world itself.

那仅仅是心灵可以设想的东西,而在现实的经验世界中,却是不可能存在的

耶鲁公开课 - 死亡课程节选