1. Download and install the old version of the roaming browser on your computer. After installation, open the web page of the online course, click to enter the settings of the browser, and set it to forced speed mode in the advanced settings.

2. Quickly click on the online course video to be brushed, and put the mouse in the video box. At this time, a horse-like icon will appear in the upper right corner of the video frame, and then move the mouse to the icon. The speed is many times. Adjust the playback speed you want, and then click Play.