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通过多年调查，将永嘉县板栗资源划分为早熟、中熟、晚熟３个类型，在此基础上筛选出１２个优良单株。
Through years of investigation, chestnut resources in Yongjia County were divided into three types: early maturity, medium maturity and late maturity. Based on this, 12 excellent individuals were selected.