最后，您将创建一个命令行应用程序，它生成一些关于该数据的有用报告，这些报告根据人口从多到少的顺序显示州、地区或国家列表。
Finally, you will create a command-line application that produces some useful reports on this data, showing a list of states, regions, or countries in the order of highest to lowest population.
OSX通过事件处理机制，自动向你的应用报告手势变化；
OS X provides automatic support for reporting gestures to your app through the normal event-handling mechanism;
OSX通过事件处理机制，自动向你的应用报告手势变化；
OS X provides automatic support for reporting gestures to your app through the normal event-handling mechanism;
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