了解这一设计是至关重要的，因为如果需要在命令行中执行任何操作，都必须能够与用户来回通信。
Understanding this design is critical because if you want to get anything done on the command line, you must be able to communicate back and forth to the user.
在某些情况下，你需要为习惯于命令行界面的用户设计，他们强烈希望支持键盘输入。
In some cases, you will be designing for users who are accustomed to working on command-line operating systems and the applications made for them. They will be keen to have keyboard support.
在某些情况下，你将为已经习惯于在命令行操作系统和应用程序中工作的用户设计。
In some cases, you will be designing for users who are accustomed to working on command-line operating systems and the applications made for them.
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