It's the same computation. But this is a nice way of writing it, often called defensive programming.

这跟原来的计算过程没什么不同,但这是写代码的更优秀的一种方式。

麻省理工公开课 - 计算机科学及编程导论课程节选

His shield, in addition to being a defensive thing, is also potentially an offensive weapon.

他的盾牌,除了能提供防御和保护之外,同样也是一个潜在的有力武器

耶鲁公开课 - 古希腊历史简介课程节选

But here's where I'm going to practice a little bit of defensive programming.

但是这儿我们要把编程的,防御性做的好一些。

麻省理工公开课 - 计算机科学及编程导论课程节选

just being able to keep saying from a person's perspective which is very hard to see when you get very tense and very defensive. And it's just so good for me to have have someone like Saed especially with Saed personally, just to have that gate.

就是能够,从一个个人的角度聊问题,而如果你很紧张就很难做到这一点,很有戒备心的时候就很难，所以我能够,有Saed是非？牡？,有这扇门。

普林斯顿公开课 - 人性课程节选

The hoplite himself is marked by, first of all, the shield and second of all, as we continue to think about his defensive capacities, he has a certain amount of armor to protect his body.

重装步兵的标志,首先就是盾牌,其次,和我们将要说到的防御力有关,就是士兵的身体有一定程度的护甲保护

耶鲁公开课 - 古希腊历史简介课程节选

I've certainly written code that has this problem, I've tried to use my own code that has this problem, and good to us, right, good hygiene, I'm going to use that word again here, of getting into the habit of writing defensive code up front, it's part of that collection of things that you ought to do is a great thing to do.

我举手了吧？,我当然写过犯这种错误的程序了,我也尝试过应用含有这种错误的代码，不错，好的卫生，我还是要用这个词,对我们有帮助，养成写防卫性,代码的好习惯，是你应该做的,一系列事情之一,也是我们日后要做的主要的事情。

麻省理工公开课 - 计算机科学及编程导论课程节选