Foreign source words, as a branch of lexicology, shows similar problems and needs further work on its definition, categorization, and identification of word formation processes.

• 而外源词，作为词汇研究中的一个子集，其涉及面虽然广至历史、地理、文化、社会、语言、民族、翻译等诸多方面，但门庭却一直显得冷清。