本论文以汉语介词中境事介词，即处所介词和时间介词为研究对象。

This paper takes the location and time prepositions as the research subject.

youdao

本论文以汉语介词中境事介词，即处所介词和时间介词为研究对象。

This paper takes the location and time prepositions as the research subject.

youdao