betacism
In historical linguistics, betacism is a sound change in which (the voiced bilabial plosive, like in bane) shifts to (the voiced labiodental fricative, like in English vane). Betacism is a fairly common phenomenon; it has taken place in Greek, Hebrew, and Spanish, among others.
网络释义
短语
专业释义
英英释义
英汉双解大词典