Cluster headaches occur in cycles: sufferers can experience several headaches a day for weeks or even months on end.

VOA: standard.2009.12.17

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

Bank failures occur when there's not enough gold in the vault and then people start asking for the gold and the goldsmith banker doesn't have it to give out.

当金库没有足够的黄金时,银行就会倒闭,因为当人们开始索要黄金时,金匠银行家却拿不出来

耶鲁公开课 - 金融市场课程节选

For Petru Russo, the headaches can occur up to 10 times a day.

VOA: standard.2009.12.17

It actually takes several chapters to reach a resolution, and God pouts for quite a while, but a renewal of the covenant does occur, and another set of stone tablets is given, and according to one rabbinic text the broken tablets, as well as the new tablets, are both placed in the ark .

有很多章节描述了达成解决方案，上帝生气了很久，但是更新的契约出现了,上帝给了另一块石法板，一部犹太教义的文本显示，破碎的石法板，和新的石法板，都放在藏经柜中。

耶鲁公开课 - 旧约导论课程节选

The challenger contends that ballots marked for Mr.Karzai are arriving from districts where voting did not occur and turnout is being reported as high as 40 percent in areas where only 10 percent of voters cast ballots.

VOA: standard.2009.08.23

In the time it takes for one cell division to occur, it could be that this cell entraps a different chemical composition of the cytoplasm then this entraps, and that's a well known concept.

当一个细胞分裂发生期间,很可能这个细胞截留了一种不同的,细胞质化学组分,这种非对称分裂是一个广为人知的概念

耶鲁公开课 - 生物医学工程探索课程节选

The agency notes cultural differences, views and attitudes toward suicide influence whether people will attempt suicide and whether suicides will be accurately reported The WHO report says most suicides in occur in Asia, which accounts for up to But it reports Eastern European countries have the highest rates of suicide.

VOA: standard.2009.09.10

Well, I think that if the great majority of people try to derive maximum utility out of a service, like using cell phones and the convenience that cell phones provide, that sacrifice is necessary for satisfaction to occur.

我觉得如果绝大多数人想要,从某项服务中获得最大功利，比如使用手机，享受手机所带来的便利，那么为了满足需求，这种牺牲就是必要的。

耶鲁公开课 - 公正课程节选

Meaning, we're going to try to help you with how to develop good programming style, but you need to write in a way in which it is going to be easy for you to spot the places that cause those semantic bugs to occur.

这意味着我们会帮助你,形成良好的编程风格，但是你需要去以一种,容易发现,程序中,容易发生语义bug的地方的方式去写代码。

麻省理工公开课 - 计算机科学及编程导论课程节选

He said that for me that the myth of the past is a golden age, that he always harking back to occur in Grand Detour in Illinois.

他说对于他来说,过去之谜就是一段黄金时间，就是他经常,出现在伊利诺伊州Grand，Detour时。

麻省理工公开课 - 电影哲学课程节选

And when I go to the A-1 Toyota for my service or to buy my new Camry, which I've done every four years for the last two decades, I don't always think of a slave market but it does occur to me that--.

当我去丰田A1店,接受服务或购买我的新佳美的时候,过去二十年中我每四年都会去一次,我不是总会联想到奴隶市场,但我确实曾经那么想过

耶鲁公开课 - 美国内战与重建课程节选