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Hardcover. Condition: New. Language:Chinese.HardCover.Pub Date:2020-12-01 Publisher: Guangxi Education Publishing House's hard work for the educated youth in the countryside. the hardships of substitute teachers. the pioneering work of teaching and research staff. the courage to take the stage at the age of 50. after retiring at the age of 60 Opening up a new world. at the age of seventy. he still rushes to studios in many places across the country. Teacher Yu is always struggling with it.?Since the first year on the.