Abstract: A method for playing back a presentation video is provided. The method includes: displaying a playback interface for a presentation video in response to a trigger operation on the presentation video; displaying a segment topic in the playback interface; and playing back a target sub-video corresponding to the segment topic in response to an operation on the segment topic. The segment topic is determined based on content identification of a segment in the presentation video, and the target sub-video includes segments with the same segment topic.

Abstract: The invention discloses a preparation method of high-absorptivity silica as lutein carrier. The method includes adding sodium silicate into a synthesis kettle, introducing steam for heating while stirring, adding water, stirring for reaction to obtain a reaction substrate A, and adding sulfuric acid to the reaction substrate A to obtain reaction solution B; simultaneously adding sulfuric acid and sodium silicate into the reaction solution B, performing synthesis reaction for a given period of time, stopping feeding of sodium silicate, adding sulfuric acid only for post-acidification, and aging to obtain dilute slurry D; and filtering the dilute slurry D, washing, slurrying, drying and packaging to obtain silica microspheres as lutein carrier. The invention accurately controls each process so that the prepared high-absorptivity silica as lutein carrier has high adsorption and good dispersibility and flowability after adsorbing lutein.

Abstract: The invention discloses a preparation method of high-absorptivity silica as lutein carrier. The method includes adding sodium silicate into a synthesis kettle, introducing steam for heating while stirring, adding water, stirring for reaction to obtain a reaction substrate A, and adding sulfuric acid to the reaction substrate A to obtain reaction solution B; simultaneously adding sulfuric acid and sodium silicate into the reaction solution B, performing synthesis reaction for a given period of time, stopping feeding of sodium silicate, adding sulfuric acid only for post-acidification, and aging to obtain dilute slurry D; and filtering the dilute slurry D, washing, slurrying, drying and packaging to obtain silica microspheres as lutein carrier. The invention accurately controls each process so that the prepared high-absorptivity silica as lutein carrier has high adsorption and good dispersibility and flowability after adsorbing lutein.