因为大量使用化肥，中西部地区的硝酸盐含量很高。
High levels of nitrate occur in the Midwest because of the heavy use of fertilizers.
这项调查使用的是对中西部地区2000人的随机取样。
The survey used a random sample of two thousand people across the Midwest.
周三，一股极地风给中西部地区带来了刺骨的严寒。
On Wednesday, a polar wind brought bitter cold to the Midwest.
为了促进教育公平，中国已投入360亿元，用于改善农村地区教育设施和加强中西部地区农村义务教育。
In order to promote education equity, China has invested 36 billion to improve rural educational facilities and strengthen the rural compulsory education in the central and western regions.
同时，大雪已经覆盖部分高中西部地区。
Meanwhile snow continues to blanket parts of the upper Midwest.
当中西部地区应对近期的洪灾时，国家最大产量州-加州正面临越来越严重的干旱。
While the Midwest deals with recent flooding, the nation's top agricultural state, California, faces increasingly dry conditions.
当中西部地区应对近期的洪灾时，国家最大产量州-加州正面临越来越严重的干旱。
While the Midwest deals with recent flooding, the nation's top agricultural state, California, faces increasingly dry conditions.
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