中文说明：这是个建模介绍 希望有启发
English Description：
This is an introduction to modeling. I hope it is enlightening
This is an introduction to modeling. I hope it is enlightening
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中文说明：这是个建模介绍 希望有启发
English Description：
This is an introduction to modeling. I hope it is enlighteningMH-Sep2007_GrandCanyon.pdf