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With fertilizer prices jumping nearly 50% per metric ton over the last year in some places, human waste is an attractive, and often necessary, alternative.
出自-2016年6月阅读原文
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It will drive producers of chemical fertilizers out of business.
出自-2016年6月阅读原文
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In cases where sewage mud is used, expensive chemical fertilizer use can be avoided.
出自-2016年6月阅读原文
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Facing water shortages and escalating fertilizer costs, farmers in developing countries are using raw sewage ( ' , 下 水道污水) to irrigate and fertilize nearly 49 million acres of cropland, according to a new report—and it may not be a bad thing.
出自-2016年6月阅读原文
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But frequently untreated human waste harvested from lavatories is delivered to farms and spread as fertilizer.
出自-2016年6月阅读原文
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Facing water shortages and escalating fertilizer costs, farmers in developing countries are using raw sewage to irrigate and fertilize nearly 49 million acres of cropland, according to a new report—and it may not be a bad thing.
2016年6月六级真题(第二套)阅读 Section C
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These practices include grazing animals on grasses grown from the pastureland's natural seed bunk, and fertilized by the cows' own fertilizer.
2019年12月六级真题(第三套)阅读 Section B
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with fertilizer prices jumping nearly 50% per metric ton over the last year in some places, human waste is an attractive, and often necessary, alternative.
2016年6月六级真题(第二套)阅读 Section C