计算机起着文字处理器的作用，一篇讲话的文本可随时输入。
The computer acts as a word processor where the text of a speech can be input at any time.
当开始为任何有状态的文本文件编写处理器的任务时，问一问自己，您希望在文件中找到什么类型的输入项。
When you begin the task of writing a processor for any stateful text file, ask yourself what types of input items you expect to find in the file.
当你在一个文字处理器或文本输入框中输入，输入的字就会替换所选的文本。
When you type in a word processor or text-entry box, you replace what is selected with what you are typing.
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