protolanguage

详细解释:n. 原始母语

详细解释：

pro.to.lan.guage

n.（名词）
A language that is the recorded or hypothetical ancestor of another language or group of languages.Also called Ursprache
原始母语：一种是另一语言或语组的有记载的或假设的母语的语言也作 Ursprache