Phonetics is defined as the study of the phonic medium of language,it is concerned with all the sounds that occur in the world's languages. 语音学是指对语言媒介进行的研究，它关 注语言世界的所有语音。 Phonetics is defined as the study of the phonic medium of language, it is concerned with all the sounds that occur in the world’s languages.  语音学是指对语言媒介进行的研究，它关 注语言世界的所有语音