耕地

The exploitation of huge areas of virgin forest in both Sichuan and Yunnan provided timber and land for agricultural use but also exposed substantial reserves of crocidolite.

四川省和云南省大面积的原始森林开发不仅提供了木材和农用耕地，还使大量的石棉矿暴露在外。

Cool. But there's only so much cropland on the planet?

：太酷了。但是地球上的耕地是有限的。

The result is the area of cropland that human needed, but not of cropping.

一个国家或地区的作物生产是通过轮作进行的，某些地区存在耕地的弃耕现象。

The results showed that grassland and cropland were the main land use types in Huhhot City.

结果表明，草地和耕地是呼和浩特市的主要土地利用类型。

China still have 276 million mu farmland and 136 million mu cropland affected by the drought.

中国仍然有276百万亩耕地和受干旱影响的136百万亩农田。

Today eighty percent of the cropland for soybeans, maize and cotton in the United States is transgenic.

今天，美国80%的耕地种植的大豆，玉米和棉花属于转基因。

Urbanization is another, smaller, difficult to estimate cause of annual cropland reduction.

城市化是另一个较小的问题，很难估计每年其造成的耕地减少量。

Therefore, it is significant to study the change of cultivated land in both theory and practice.

因此，展开耕地资源变化的研究具有重要的理论意义和实践意义。

Cultivated land is the base of agriculture production, and is an important factor to ensure food security.

耕地是农业生产的基础，是维护粮食安全的重要保障。

The protection of cultivated land is fundamental national policy of our country.

耕地保护是我国的一项基本国策。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。