First, the differences in context. Every word has a specific referent in a specific semantic environment. The same word has different connotations and meanings in different times and languages.
Second, the differences of the times are also reflected in the changes of language and writing. The New Culture Movement is a watershed of language. In the New Culture Movement, Hu Shi and Chen Duxiu advocated literary improvement and literary revolution. As a writing carrier in line with the modern spirit, vernacular Chinese has been accepted by the whole country in just a few years. China's traditional ancient prose is vague and general, while modern prose pursues clear language.