我们不应让废弃物污染我们的河川。

We should not pollute our rivers with waste.

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这些河流和河川系统被称作“外源河流”，因为它们的源头位于干旱地区之外。

These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone.

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而全球水荒又完全是另一回事，会冲击到全球粮食和其他作物的供给、并波及全球河川湖海。

A global water crisis, which impinges on supplies of food and other goods, or affects rivers and lakes everywhere, is quite another.

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