普通话语音的四声是指阴平、阳平、上声、去声四个声调
阴平
(of Chinese phonetics) a classical name for the 1st tone
阳平
(of Chinese phonetics) a classical name for the 2nd tone
上声
[Phonetics] the falling-rising tone (in Chinese pronunciation)
去声
[Phonetics] the falling tone (in Chinese pronunciation)
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