美国农业部的数据表明从20世纪80年代早期至90年代中期，全国范围内的耕地侵蚀数量大体上在下降，然后主要的就是停滞不前。
U.S.D.A. data shows that the amount of farmland erosion nationwide from water fell substantially from the early 1980s to the mid-1990s, then largely stagnated.
据估计，三分之一的可耕地为酸雨区，一些气候学家预测在长期范围内该国的粮食作物将出现减产。
By some estimates acid rain falls on a third of all agricultural land; some climate experts predict long-term reductions in the country's vital rice crop.
这也明显的表明总体的范围非常大：8000万公顷，这比英国，法国，德国和意大利的耕地总面积之和还要多。
It is also clear that the overall scope is vast: 80m hectares is more than the area of farmland of Britain, France, Germany and Italy combined.
阐述了坡耕地垄向区田的基本原理、应用范围及技术要点。
This paper discusses the basic theory, applied region and technical main point of the hillside cultivated alleg directed regional field.
③区域范围内人口分布与经济总量高度相关，人口与耕地表现出较弱的正相关性；
In the region, population distribution is highly correlated with the total economic output, population and cultivated land shows a weak positive correlation;
③区域范围内人口分布与经济总量高度相关，人口与耕地表现出较弱的正相关性；
In the region, population distribution is highly correlated with the total economic output, population and cultivated land shows a weak positive correlation;
应用推荐