因此一个教学大纲在最后获得批准之前常常要经过多次修改。
So it is common that a syllabus has to undergo several drafts before it is finally approved.
此框架存在的历史最久，已经经过多次修改和bug修正以使其用于产品用途时更加稳定。
This framework has been around the longest, and has been through many revisions and bug fixes to make it stable for production use.
经过多次修改，目前也有管理结构化数据、动态数据配置、递归(过程调用自身)等等功能。
It has been revised several times and now includes capabilities for handling structured data, dynamic data allocation, recursions (procedures that call themselves), and other features.
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