黄淮平原
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huanghuai plain
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Grain yield per unit area increased continually during the past near 50 years in HuangHuai -hai plain, and its increasing speed in recent years still kept higher than the average of all the country.
建国以来黄淮海平原粮食单产持续增长，近年来仍然高于全国同期单产增速。
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