例如，这种柑橘可以在零下很多度的寒冷地方种植。

For example this one of a kind citrus may be planted in cold places where temperatures descend many degrees under 0.

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近半个世纪，在全世界的很多地方，寒冷的白天和夜晚都变得更加少见，而热天气则更加常见。

In many parts of the world, cold days and nights have become rarer, and hot days and nights more common, over the past half-century.

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奥巴马在爱奥华州发表演说，那里是他在1月的一个寒冷夜晚首战得胜的地方。

Obama spoke in Iowa, where he won his first contest on a cold January night.

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