用来指定要分析的工作表的选项
为每次调用重新装入样式表的选项（同样，这对更新样式表时的调试有用）
The option to reload the style sheet for each invocation (again, this is useful for debugging when the style sheet is being updated)
这可能意味着学生的选择减少了，但我们可以制作一个固定的时间表，里面有所有的课程和选项，这样他们可以查看可以选什么课程。
It may mean less choice for students but we could create a fixed schedule of all the courses and options and they could then view what was available .
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