The paths through the woods were often overgrown, so water travel was much faster.

穿过树林的小路常常杂草丛生，所以从水路走要快得多。

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Often the cheapest way to provide irrigation water in the dry tropics is through small-scale projects, such as gathering rainfall in depressions and pumping it to nearby cropland.

在干旱的热带地区，提供灌溉水的最低成本的方法通常是建造小规模的工程。例如，在洼地收集雨水，然后将其抽调至附近的农田。

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It is emitted through smokestacks and deposited in rain and snow, often making its way into the water.

烟囱排放及雨雪沉积后，汞常常进入水中。

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Mutesi wakes at 5 a.m. every morning to "begin a two-hour trek through Katwe to fill a jug with drinkable water, walking through lowland that is often so severely flooded by Uganda's torrential rains that many residents sleep in hammocks near their ceilings to avoid drowning, " he wrote.

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Every tricky traverse in mountain, stream or forest needed doing twice over: once to find a way for himself, then to collect the steed, often carrying it shoulder-high through sharp palmetto, or water, or rocks.

ECONOMIST: Ian Hibell