We have always known pretty much when it will rain, what the temperature will be each summer and winter, and how high the rivers will flow.

我们一直相当清楚什么时候会下雨，每年夏季和冬季气温是多少，河水流量有多大。

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As global warming melts mountainglaciers, the rivers’ summer flow has dwindled by up to 60% (more inone case) of their historical average.

一方面随着全球气候变暖，高山冰川溶解，河流的夏季水量较历史平均水平缩减了近60%。

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Storage is essential to provide supplies in winter (two-fifths of the Indus's flow comes from the summer melting of glaciers) but Pakistan's two big dams are silting up.

蓄水对于冬季供水至关重要（五分之二的印度河流量来自夏季冰川融水），可巴基斯坦的两个大水坝已经淤塞。

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