To dub a clip of a movie on a computer, you needed to use video editing software such as Adobe Premiere Pro, Final Cut Pro, iMovie, etc. These applications all provided audio editing functions to add, edit, and adjust audio volume, balance, and rhythm. Before you start dubbing, you need to import the video into the software and select the required audio track. Then add or delete audio clips as needed, adjust the volume and balance, and add music or sound effects to enhance the effect. In order to do better dubbing, it is recommended to learn some basic video editing skills such as editing, color matching, and audio processing. This way, he could better combine the sound and image to create a better dubbing effect.