cognate xenolith

例句：

1. 1. The study of cognates has shed light on the evolution of language.
   研究同源词揭示了语言的进化。
2. 2.Cognates are often used in linguistics to compare words across languages.
   同源词在语言学中常被用来比较不同语言中的单词。
3. 3.Homologous structures are found in both plants and animals, indicating a common evolutionary origin.
   同源结构在植物和动物中都存在，这表明它们有一个共同的演化起源。