But that is changing, argues Calestous Juma of Harvard University.
但这一情况正在改变，哈佛大学的克莱斯特·朱马说。
Major rivers flowing through Beijing include Yongcing river, Chaobai river, north Canal and Juma river that mostly originated in the northeastern mountainous areas of Beijing.
穿过城市的主要河流包括永定河，潮白河，北运河和拒马河。它们大多源于北京东北部的山脉地区。
Major rivers flowing through Beijing include Yongcing river, Chaobai river, north Canal and Juma river that mostly originated in the northeastern mountainous areas of Beijing.
穿过城市的主要河流包括永定河，潮白河，北运河和拒马河。它们大多源于北京东北部的山脉地区。
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