DDL is the abbreviation of deadline, especially the various tasks that universities have to complete, which are most likely to appear in the final exam. Once used, it means that the moment of "life and death" has arrived, expressing the feelings of college students' "life and death consciousness".
Pre is the abbreviation of the English word presentation. Presentation is a keynote speech, that is, speaking on a topic with ppt.
Keynote speech: refers to a speech that chooses a theme and prepares a speech around this theme. A speech should have a correct and distinct theme, which can best reflect the ideological value and aesthetic taste of the speech and make it have a profound and touching artistic charm.
The theme of the speech can't stay in empty preaching, listing phenomena and repeating cliches; The correct way is to analyze, summarize, refine and extend the essential connotation of the materials in time when using typical and sufficient materials to express the theme of the speech, and arouse the audience's psychological buzz through rational language guidance and rendering, so as to lead the audience's thinking to a deeper and more lofty realm and sublimate the theme of the speech.