This is Pavlov's famous dog and it's an example of scientific serendipity.

这便是巴甫洛夫的那条著名的狗,这是一个科学研究中的意外。

耶鲁公开课 - 心理学导论课程节选

An individual has risk of certain bad things happening.

一个人有可能发生意外。

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In fact, I dug up this from a few years ago it was actually pretty fortuitous like the day before one of CS50s lectures the original iPhone was cracked.

实际上，我在几年前,发现了这个，这是相当意外的,就像在一个CS50演讲前一天,我的iPhone，坏掉了。

哈佛公开课 - 计算机科学课程节选