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简介：There was a rustling sound under the podium, the scene was a bit messy, and the light in the classroom was a little dim. The light particles fell on the old man Yan's face like a fleeting glimpse, which was full of wrinkles. Cheng Keshu, who was sitting in front, raised his head and suddenly found himself unconscious on the ground. One head fell, and it was completely silvery white.