本文討論董同龢、李方桂、馬學良三位對於上古漢語清鼻音來源的看法，並且說明上古漢語的 *s- 前綴能清化濁鼻音（s-m＞hm、s-n＞hn、s-ng＞hng）也能清化濁阻塞音（s-b＞p、s-d＞t、s-g＞k）。最後嘗試證明上古漢語動詞濁清別義（敗 *b／敗 *p）的來源是使動化 *s- 前綴。

　　This paper discusses the views of Li Fang-kuei, Tung T’ung-ho and Ma Xueliang concerning the source of voiceless nasals in Old Chinese, and shows that the *s- prefix can devoice nasals (s-m > hm-, s-n > hn, s-ng > hng) as well as obstruents (s-b > p, s-d > t, s-g > k). Finally the paper attempts to show that the causative *sprefix is the source of voicing alternation (敗*b-/敗*p-) in Old Chinese.

上古漢語清鼻音 *hm-、*hn-、*hng-; 上古漢語的 *s- 前綴; 動詞濁清別義; 李方桂; 雅洪托夫; 馬學良

OC voiceless nasals *hm-, *hn-, *hng-; *s- prefix in Old Chinese; voicing alternation in Old Chinese (敗*b/敗*p); Li Fang-kuei; S. E. Yakhontov; Ma Xue-liang