It's a common mistake to make if you forget that I've actually declared that variable up top, but wait a minute, I know any time that I use a variable, I have to declare it.

这是一个通常犯的错误，如果你忘了,之前在前面已经声明了这个变量，等等，我知道在任何时候,我使用一个变量，我必须声明它。

哈佛公开课 - 计算机科学课程节选

We have this one parting gift-- just a little legal waiver for the cameras if you would.

我这有份临别赠礼-,准许我们使用您肖像权的声明，希望您笑纳。

哈佛公开课 - 计算机科学课程节选

And for that, we're going to have statements.

为了达到这个目的，我们就得使用声明了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Well, this will, in fact, be declared, but, unfortunately, you're using a different chunk of memory.

好的，这个被声明了，但是，不幸的是，你在使用一块不同的内存。

哈佛公开课 - 计算机科学课程节选

Well, simply with the * notation at least on the way in when you declare the function called swap, you simply say this is not going to take an int and another int because that's useless.

好的，简单说，当你声明一个函数调用swap函数时,使用*符号，你可以简单说，这不能使用一个int数和另外一个int数,因为那是无效的。

哈佛公开课 - 计算机科学课程节选