语源学

例句：

1. 1. Linguists study the origins of languages to understand their evolution.
   语言学家研究语言的起源，以了解其演变过程。
2. 2. Etymology is the study of the origin and development of words.
   词源学是研究词语起源和发展的学科。
3. 3. The study of language's origins is a fundamental part of linguistics.
   研究语言起源是语言学的基本部分。