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The entrance to the No. 4 High School with a sign that reads "Entering school grounds, please speak Mandarin," left, in Peyzawat, Xinjiang region. © 2018 AP Photo/Ng Han Guan — The entrance to the No. 4 High School with a sign that reads "Entering school grounds, please speak Mandarin," left, in Peyzawat, Xinjiang region.

© 2018 AP Photo/Ng Han Guan