2. The subtitle file is a document with one sentence and one line, each line does not exceed 15 words.
3. Sentences are not simply broken according to the number of words, but according to the content.
4. Only the punctuation, interval number, hyphen and quotation marks of the title and words with special meanings can appear in the subtitles. Each screen of subtitles uses spaces instead of punctuation to indicate tone pause, and all punctuation and spaces are full-width.
5. Mathematical formulas, chemical molecular formulas, physical quantities and units in subtitles should be presented in words as far as possible; If it is not suitable for text presentation, and it has been clearly displayed in the video screen by PPT, blackboard writing, etc. This line of subtitles can be omitted.