我建议用字段和代码创建一个命令结构来表示命令及其参数。
I recommend creating a command struct with fields and codes to represent commands and their arguments.
创建一个命令栏，该命令栏被保存并且在下次启动环境时可用。
Creates a command bar that is saved and available the next time the environment is started.
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.
应用推荐