说明：  当年为了学隐马尔可夫模型，所以边看边翻译的，如果那儿没翻译对，希望能给指出来，有利后来的人理解！ 参考文献我没有删，就留下给看看吧！因为不能是中文标题，我改为英文的吧．
(Year in order to learn hidden Markov models, so while watching the side of the translation, if there did not translate right, hope that they will be pointed out to be beneficial to understanding later! I did not delete references on the left to see it! Because should not the Chinese title, I read it in English.)