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来自MSN
21 小时
据说月牙泉的水永不干涸,是真的吗?月牙泉的水又来自哪里?
在甘肃省敦煌市西南 5 公里鸣沙山北麓,静卧着一处令人称奇的景观 —— 月牙泉。月牙泉南北长近 100 米,东西宽约 25 米,东深西浅,最深处约 5 ...
来自MSN
5 天
地球的水用了40多亿年,为何没干涸?专家从一块石头上找到答案!
谈到水,大家都了解它是生命的源泉。地球71%的面积被水覆盖,但我们主要关注的还是淡水。因为海水不能直接饮用,人类需要通过自然循环来利用淡水,因此称水为人类的生命之源并不过分。
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