There are four tones in Mandarin Chinese Pinyin, plus one neutral tone(or called "no tone").
在汉语中有四个声调，加一轻声（或称为“无音”）音。
Mandarin, the biggest language in the Chinese family, has four tones, so that what sounds just like "ma" in English has four distinct sounds, and meanings.
汉语中最大的分支普通话有四种声调，所以英语中的“ma”在汉语中就有四种不同的发音，以及各不相同的意思。
In Chinese the pitch of syllable varies with time, whose track forms different tones. By using the pitch information the error rate of Mandarin connected digits is further decreased.
各个音节的基频是随时间而变化的，其不同轨迹构成了声调，利用基频信息进一步提高了对汉语连续数字串的识别率。
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