You put some inputs in, it has a contract that says if you put the right kind of inputs in you'll get a specific output coming out, but you don't have to know what's inside of that box.

你可以将输入一些内容,它相当于一个条件合约,如果你的输入是正确的，你就能得到特定的输出,但是你不知道盒子里面有些什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

It could be the pair of none, none, it could be the pair of, you know, whatever the answer was that we put up there. That value comes back out and is now available inside the scope of Barnyard. OK. And Barnyard then uses that. Question?

也可以是，你知道，任何我们在这里得到的答案,这个返回的值在Barnyard范围内,就可以使用了,然后Barnyard就使用了这个值,有什么问题吗？

麻省理工公开课 - 计算机科学及编程导论课程节选