为了使计算机也能进行计算，大多数模型要么假设海洋是一个静止的沼泽，要么假设它们根本不存在。

To make calculations manageable even by computers, most of the models suppose either that the oceans are a motionless swamp or that they don't exist at all.

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AbrahamFlexner研究了上个世纪之交的医学景象，实务训练学校（proprietary medical schools）宽松的标准或标准不存在使他反感。

Surveying the scene at the turn of the last century, Abraham Flexner wasrepelled by the lax or nonexistent standards at American proprietary medicalschools.

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但是我仍然是个得乞求搭便车的人，不过，也不存在使我在领子下面浑身发热的理由，因为我不认可他的方式。

But I'd asked for the ride, and there was no point in getting hot under the collar because I didn't think the way he did.

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And these are using the technology to augment the real experiments with virtual atoms that show these things are really there but you can't normally see.

他们在使用这些技术,来积累实际经验,通过模拟原子,使这些东西实际存在,但一般不可见。

麻省理工公开课 - 媒体、教育、市场课程节选

Well, you show the thing that would cause you to have the fear without the unconditioned stimulus.

找出在非条件刺激不存在的情况下,能够使你感到恐惧的东西。

耶鲁公开课 - 心理学导论课程节选

First of all, negative time should not bother anybody; t=0 is when I set the clock, I measured time forward, but yesterday would be t = -1 day, right?

首先,负的时间对我们不存在任何干扰,t=0使我们设定的初始时间,我是用顺序计时,所以昨天就可以记为-1天,对吗

耶鲁公开课 - 基础物理课程节选