北方或中部那两条铁路线在冬天面临恶劣的天气，而且这两条路将通过一个叫内布拉斯加的荒野。
A northern or Central Line would face severe winter weather. And it would have to cross a wild area called Nebraska.
官员表示北方恶劣的天气条件也影响了污染物的扩散。
Officials say unfavourable weather conditions in the capital have prevented pollutants from dispersing.
北方天气恶劣可能会造成粮价失控。
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