关于纳西语的松紧元音问题──兼论彝缅语语音历史演变的研究方法戴庆厦杨焕典教授在《从纳西语的紧松元音对立看汉藏语系语音发展轨迹》（以下简称《杨文》）中①，认为“纳西语中不仅有紧松元音对立，而且数量还不小”，不同意我和胡坦教授在《哈尼语元音的松紧》一文中所说 On the Tight Vowels of Naxi Language - A Concurrent Study of the Historical Evolvement of Yi-Burmese Phonetics Dai Qingxia Professor Yang Huan-xian wrote a book titled “The Development of Phonetics of Chinese-Tibetan Phonology” from the Opposition of Compact Vowels in Naxi Language (hereinafter referred to as “Yang Wen” ) ①, that “Naxi language is not only tight loose vowel opposition, and the number is not small,” I do not agree with Professor Hu Tan in the “Hani Vowel elastic” said in a text