It was a dangerous thing to do. Some experts said he was lucky to survive.

VOA: special.2009.01.14

Remember that the lucky thing about the smallpox vaccine was that a naturally occurring attenuated form of the smallpox virus variola called vaccinea was found.

对于天花病毒来说,幸运的是,存在一种自然发生的,被称作痘苗病毒的,天花病毒的衰减疫苗

耶鲁公开课 - 生物医学工程探索课程节选

Now I look at that element. Is it the thing I'm looking for? If I'm really lucky, it is. If not, I look at the value of that point here and the thing I'm looking for. And for sake of argument let's assume that the thing I'm looking for is smaller than the value here.

现在我们瞧瞧指向的元素,它是我们找的值么？如果足够幸运，他就是，如果不是,我们比较指向的元素,同我们要找的元素，方便起见,假设要找的元素比这里的值要小。

麻省理工公开课 - 计算机科学及编程导论课程节选