简单的说，这个接口提供了关于调用程序、消息、当前环境的细节的动态运行时信息。
In short, this interface provides dynamic run-time information about the details of the caller, the message, and the current environment.
当使用动态语言的时候，你需要在头脑中记住系统更多的细节才能够编程。
When working with a dynamic language, you have to keep more of the system in your head in order to program.
大致的细节可以透过前几天的动态以及股市的历史教训推演出来。
This is where the action of the last few days and the lessons of stock-market history can suggest the likely details.
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