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石景山区老山汉墓的发掘引起社会的很大关注：有人判断，这座古墓当是刘旦的墓。这让笔者想起了与刘旦相关的戾陵堰与车厢渠。戾陵堰是北京历史上有记载的最早的一项大规模水利工程，对北京古代的农业发展有深远的影响。史学界对戾陵堰的具体位置一直没有定论，大致的说法是在
Excavation of Laoshan Han Tomb in Shijingshan District has aroused great concern in the society: Some people judge that this tomb is Liu Dan’s tomb. This reminds me of the Danling weir and the car canal associated with Liu Dan. Chongling weir is the earliest recorded large-scale water conservancy project in Beijing history and has a far-reaching impact on the ancient agricultural development in Beijing. Historians have not been conclusive about the exact location of Chongling weir