[Keywords]：artificial intelligence; machine translation; speech recognition; triphone model; observation density;
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It has great impact on the recognition performance how well HMM observation density can describe the actual distribution.
H MM的观测概率能否很好描述模型的实际分布对识别性能有很大的影响。
By using observation data over 50 years, the paper systematically analyzed the relations of different stand density with diameter, height, crown of trees and so on.
利用近50年的系统定位观测资料，分析红松果材兼用林不同林分密度与直径、树高、冠幅等主要测树因子的关系。
Scientists predicted that the gas would have a high temperature and so it would primarily emit low-energy X-rays. But its very low density made observation difficult.
科学家们预言气体温度可能很高于是会主要发射出低能的X射线。但是其过低的密度给观测带来困难。
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