突然出现了两个男人。

Two men suddenly appeared.

youdao

他躲藏了起来，看了一会，然后突然出现了。

He hides and watches, and then suddenly appears.

youdao

过了一会儿，简突然出现了，从前门进来。

A moment later Jane materialized, coming in the front door.

《柯林斯英汉双解大词典》

It's about how so many plans in finance are messed up by rare events that suddenly appear out of nowhere.

书中提到金融界中突然出现的小概率事件,怎样搞砸了无数计划

耶鲁公开课 - 金融市场课程节选

The mathematical theory of probability was unknown until that time and you can see that insurance suddenly made an appearance at that time.

在那之前,概率的数学理论,是不存在的,而随着概率论的出现,保险业也突然出现了

耶鲁公开课 - 金融市场课程节选

It's that moment in which Phoebus Apollo makes a sudden and unexpected appearance.

太阳神阿波罗,突然而又出人意料的出现了。

耶鲁公开课 - 弥尔顿课程节选