他们新开垦的耕地面积达五千公顷。
The area of their newly cultivated land has come to/reached five thousand hectares.
蒙古是18世纪世界上面积最大的国家，不过蒙古的可耕地面积非常少，大部分都是草地。
Mongolia is the 18th largest country in the world by area. However, it has very little arable land: much of its area is grassland.
这儿的耕地很少，面积不大；这儿的景物除了很少的例外，只见那些广阔的生长茂盛的大片草地和树木覆盖着大山中间的山峦和小谷。
Arable lands arc few and limited; with but slight exceptions the prospect is a broad rich mass of grass and trees, mantling minor hills and dales within the major.
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