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分類：自然
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簡介：世界有三大河流在中國，分別是長江、黃河和瀾滄江。在1978年，科學家發現卡日曲可能要超過傳統上認定的黃河正源頭瑪曲的長度，因此黃河的源頭可能會改變。經過科學家測量，最終發現卡日曲水流量比瑪曲充沛。收起
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