但是，作物高产方面的成功导致了自满情绪，并妨碍了更进一步增产的研究——这是现在急需的——特别是对可耕地较少的地区。
But success in higher yields led to complacency and a decline in research for further – and now necessary – gains, especially in less-arable lands.
由于中国人口稠密、西部地区环境恶劣，且存在污染问题，中国国土中可耕地的比例小于美国。
A smaller portion of its land is arable because of overcrowding, a harsh environment in the country's western region and pollution.
乌干达可耕地占东非地区的一半，因而可以成为该地区的粮仓。
Uganda has half of East Africa's arable land and could become the granary of the region.
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