如果某个技术被证明是不可取的，我们当然必须确保该技术不被使用。

If the technology is found to be undesirable we must of course, ensure that it is not used.

youdao

不知怎么的，从大学开始到现在为止的15年里，我已经设法去收集能堆满屋子的东西，其中一些是早早就不被使用了的。

Somehow in the 15 years since college, I have managed to accumulate a household full of "things", some of which have not been used in a very long time.

youdao

由于补偿服务在运行时有一个相关的、不变的输出消息，它的输出消息可能从来不被使用，如作为其它补偿服务的输入。

Since a compensation service has an associated, unchangeable input message at the time it is run, its output message can never be used, for example, as input to another compensation service.

youdao

One of the discomforts, one of the reasons that I think so many people in society and even in this class are uncomfortable when it comes to computers and intimidated by technology and kind of throw up their hands when things go wrong that you don't understand is frankly not necessarily your fault.

当我想到在社会中，即使在这个班级上,有那么多的人,使用计算机时是不舒服的,他们被这种科技吓到了，束手无策,当发生故障时，你也不知道，其实,这也不是你的过错。

哈佛公开课 - 计算机科学课程节选

What is this? This is a wonderful piece of abstraction. It is saying, you don't need to know squat about what's inside the body of this function. You don't have to worry about the parameter names, because they're going to be preserved, you don't need to worry about how I'm doing it, this tells you how you can use this, in order to use it correctly. Of course, I can then close it off, and off we go.

但是这能告诉你一些信息,这是什么？,这是一段完美的抽象,它的意思是你不需要知道,这个函数的内部构造，你不必担心参数是否重名，因为它们已经被预存了,你不需要担心我如何使用它,它告诉了你你该如何操作，从而正确的使用它，当然我也可以把它关掉。

麻省理工公开课 - 计算机科学及编程导论课程节选