另外，第三章在介绍HMM模型时，实现了一个汉语四声声调的识别系统。
Moreover a mandarin tone recognition system was developed in chapter three when we presented the HMM model.
关于汉语四声形成的原因，陈寅恪先生认为是由于“转读”佛经与古印度声明论之传入所致。
Chen Yinque thought that four tones of Chinese came into being because of the "reading in Chinese" of sutra and the introduction of the theory of "tone" in ancient India.
他们给了参与实验者四种相似的蓝色和绿色色调，并告诉他们一些虚拟出来的名字，比如毫无意义的汉语单音节词“song”（第四声）。
They took four similar shades of green and blue and gave them made-up names—meaningless Mandarin monosyllables like sòng.
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