和北京沒啥關係，是保天津。北京平均海拔43.5米，天津隻有3.5米。東澱蓄洪區是海河流域的蓄洪區。

來源: 泥川於 2023-08-02 15:23:29 [舊帖] [給我悄悄話] 本文已被閱讀：次

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