A student passes by a LCD screen which shows an advocated hairstyle in Beijing No 171 middle school on Aug 31, 2012. Whenever the school term starts the school shows hair and dressing norms with example photos displayed on large LCD screens. According to the norms, girls should not dye or curl their hair, long hair must be tied back and no makeup or nail polish can be worn. Boy students should not have facial hair, long hair or a shaved head. [Photo/Asianewsphoto]