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

Let me remind you of that other intrusive moment in the poem, the moment when a figure whose presence we hadn't been aware of suddenly made -suddenly asserted himself.

我来提醒一下你们，诗里有另外一个被侵入的时刻，一个我们仍未可知的，突如其来的角色,突然出现的时刻,他毫无预兆的将自己安插进来。

耶鲁公开课 - 弥尔顿课程节选

First of all,notice the obvious point that sometimes people die in their sleep,unexpectedly.

首先，有时人是在睡梦中无预兆地死去。

耶鲁公开课 - 死亡课程节选

Each side conducts sacrifices in which they ask the gods for assistance in the battle, sometimes they hope that there will be a favorable omen suggesting they're going to win.

双方会各自进行祭祀,祈求神灵的庇护,有时他们希望得到有利的预兆,告诉他们将取得胜利

耶鲁公开课 - 古希腊历史简介课程节选

It actually, it's been shown, seems to foreshadow the political philosophy of Milton's much younger contemporary, John Locke -- the notion that nature demands that every human individual has just enough, is given just enough to be self-sufficient.

事实上这一论点似乎提前预兆了,比弥尔顿年轻许多的同代人，他们的政治哲学，约翰·洛克--他认为自然要求,每个自然人拥有足够自己使用的，每个人只得到足够自给的就够了。

耶鲁公开课 - 弥尔顿课程节选