[問題請益-新手用latex畫圖
http://www.texample.net/tikz/examples/feature/trees/
A couple of examples is given above (code included). The lower right corner is what you need. Well, Hmmmmm.... it takes time to understand.
If your dead-line is close, use other methods you are familiar with to draw and convert it to eps or pdf. Then use \includegraphics[options]{file name} to incorporate it into your latex file.
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