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.
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.
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.
使用a命令在给定的匹配模式后面添加一行文本。
Use the a command to add a line of text after a given matched pattern.
但是有些控件可能有更多限制而不仅仅是一行文本。
However, some controls need to be more constrained than simply a line of text.
在这个示例中，它读取第一行和第二行文本。
In this example, it reads the first and second lines of text.
在这个示例中，它读取第一行和第二行文本。
In this example, it reads the first and second lines of text.
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