填空题 The present system of the 1derives mainly from one developed in the 1920s by the British phonetician, Daniel Jones (1881—1967) , and his colleagues at University of London. (中山大学2008研)
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【正确答案】 1、正确答案：cardinal vowels    
【答案解析】解析：基本元音是指一系列约定俗成、固定不变的元音特质，目的是为语言中实际存在的元音描述提供一个参照框架。