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专科zhuān kēspecialized subject专科学校zhuān kē xué xiàospecialized school中学zhōng xuémiddle school中学生zhōng xué shēngmiddle-school student中小学zhōng xiǎo xuémiddle and elementary school中层zhōng céngmiddle-ranking中庸zhōng yōngthe Doctrine of the Mean, one of the Four Books 四書|四书[Si4 shu1]中档zhōng dàngmid-range (in quality and price)