虚函数简单地向标准输出写一行文本。

The virtual functions simply write a line of text to standard output.

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标签是在应用程序中呈现一行文本的文本字段。

A label is a text field that renders one line of text in an application.

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输入一行文本但是不显示出来：secret。

Enter a line of text without displaying it to the user: secret.

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stdio h This file here is called standard I/O or stdio.h and this is just another text file someone else wrote many years ago and by using that line of code there, I'm telling the computer, give me acces to this code that this other person wrote that's in that file.

在这里的头文件称为标准输入输出文件或,这是由某位前人编写的文本文件,我们只需要刚才所述的一行代码，就能告诉电脑，让我连接到,这个前人在那个文件中写的代码。

哈佛公开课 - 计算机科学课程节选