I said, buddy, are you reluctant to spend money if you want to take the postgraduate entrance examination? Those videos are protected. For example, when we took the postgraduate exam last year, we had to plug in a USB flash drive or something to play the video, otherwise we couldn't play it, and we couldn't play it when we went back. Recommend a shortcut to Taobao, which is not expensive. Last year, I enrolled in the postgraduate entrance examination class and spent nearly a thousand yuan, but a buddy in the dormitory didn't enroll in the class. He bought a video on Taobao and watched it. As a result, I was admitted to University of Electronic Science and Technology of China this year. You can go and have a look. The cost performance is very high, and the clarity is absolutely enough. It is difficult for you to find such free resources in Baidu, because it costs money to crack those encrypted resources.