要构建对用户操作做出响应的代码，就需要编写在操作发生时执行的代码。
Building the code to respond to a user's actions consists of writing code to act upon that action.
为了测试访问硬件的代码，必须编写一段按照与硬件相似的方式做出响应的代码。
To test code that accesses hardware, you must write a piece of code that responds in a way similar to the hardware.
使用结构化异常处理，您的代码就可以区分不同类型的错误并做出相应响应。
With structured exception handling, your code can differentiate between different types of errors and react accordingly.
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