"It is a challenge after just a few months of implementation to be able to speak with confidence about when these things will occur,"

VOA: standard.2009.09.04

In some ways, it might just occur to me this identification of the gay gene.

某种程度上来讲，这让我想起了,同性恋基因的认定。

普林斯顿公开课 - 人性课程节选

And then, of course, not just whether the reaction will occur but, how fast it occurs is really important.

当然，我们不光要研究一个反应会不会发生,反应速率多块也是很重要的研究问题。

麻省理工公开课 - 化学原理课程节选

.. I wanted to just give some-- often the inventions that occur in finance, they seem in a way obvious.

我想说一些-,在金融领域常见的发明，从某种程度上来看，他们是很显见的。

耶鲁公开课 - 金融市场课程节选

That's why your operating systems and your personal computers often crash for no apparent reason. Just because two things happen to, once in a while, occur at the same time.

这就是为什么你的电脑或者操作系统,经常会毫无预兆的崩溃了,这是因为两件事情正好同时发生了，通常还有人工输入。

麻省理工公开课 - 计算机科学及编程导论课程节选

And this embarrassing episode is just the beginning of a sequence of embarrassing events that will occur as the Israelites move from Egypt towards the land that's been promised to them.

这令人尴尬的一幕只是,一系列尴尬事件的开始,这些都将发生在他们从埃及到应许之地的路上。

耶鲁公开课 - 旧约导论课程节选