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簡介：濕氣遇到高山時被迫上升，同時也變冷並凝結成雲，最終形成降雨，這就是所有淡水的來源。地球就在這無盡的蒸騰、凝聚、降雨的海陸間循環著水，也循環著生命，構成了生命不盡的長河。本節目介紹地球水循環對氣候、環境和生物所産生的影響，以及對生命的意義。收起
自然發現——我們的地球 不盡長河（上）[人與自然]
自然發現 我們的地球——不盡長河（下）[人與自然]
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