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<p style="text-align: left;">A graduating student at Peking University is selling inexpensive books on the sidewalk in her spare time. Some of the books are second-hand. She made a sign that said: "Buy a book and explain a homework exercise to help primary school students who have not returned to school during the COVID-19 epidemic do their homework." She said that she never thought about making money, and just hoped to help children.</p><p style="text-align: left;"><span style="color: rgb(127, 127, 127);">(Produced by Wu Yifan and Jiang Yunan)</span></p><p><br/></p>