Well, this requires the use of audio editing software such as Adobe_Audition. Of course, Pr or VideoStudio can also be used. First, find the materials: the explosion sound audio file and the audio file you want to add to it. Then open Pro or VideoStudio (I am familiar with both softwares, take this as an example) and import the previously prepared materials, then drag them one by one to the audio editing channels in the lower right corner, put one audio into one channel, and explode The audio of the sound can be moved to the time you specify. After adjustment, it can be exported (Pr) or shared (VideoStudio) as an audio file