yǔ yuán xué jiā / tōng guò / bǐ jiào / bù tóng / yǔ yán / zhōng / de / tóng yuán cí / zhuī sù / cí yǔ / de / lì shǐ / biàn huà

语源学家通过比较不同语言中的同源词，追溯词语的历史变化。

Etymologists trace the historical changes of words by comparing cognates in different languages.