The lazy setting sun shone into the classroom in the afternoon, and every student buried in the pile of books looked tired. I raised my head and glanced at it. Several students had already started fighting with eyelids, shaking their heads, and were half asleep and half awake.I lowered my head and watched a novel of immortal cultivation with relish in the high walls where the textbooks were piled up.The thickness of the novel is comparable to that of the Oxford Dictionary, it is long and wide, and the paper is thin. This kind of book is usually bought by pirated books and circulated on campuses.