The Canadian Arctic Archipelago generally receives little precipitation, and the amount of snowfall changes little from year to year.

加拿大北极群岛常年几乎没有降水，降雪量微乎其微。

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Dr Hynek said: 'The abundance of these river valleys required a significant amount of precipitation.'

海尼克博士说：“如此大量河流峡谷的形成需要极为充沛的雨量”。

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All three cooling agents can be used to either induce or suppress precipitation, depending on the amount that is administered and the condition of the clouds.

这3种冷却剂既能用来降雨，也能用来消雨。这主要取决于所用冷却剂的总量以及云的条件。

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Most of this is then absorbed by so-called carbon sinks, a mixture of photosynthesising plants and chemical precipitation, while a small amount remains to contribute to the rise in carbon-dioxide concentration that has been going on for the past 150 years.

ECONOMIST: Greenhouse gases