典型的正向工程生成“框架”或“结构桩”，留下部分结构和大部分行为代码，随后手工编写。
Typical forward engineering generates "skeletons" or "structural stubs," leaving parts of the structure and most of the behavioral code to be manually written later.
无疑, 一段代码中可以装载很多模块, 只要将import语句分行写开即可.
One script can, of course, import several modules. Just put each import statement into a separate line.
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