By 1934, it had turned the Great Plains into a desert that came to be known as the Dust Bowl.
到了1934年时，旱灾将大平原（GreatPlains）变成沙漠，这个沙漠就是有名的尘暴干旱区（DustBowl）。Watermelon production has been a principal industry in the arid and semi-arid areas in Ningxia.
西瓜是宁夏干旱半干旱区特色支柱产业，其需钾量高。The Ejina oasis, located in the lower reaches of the Heihe River, is taken as a typical example among the arid-area oasis.
黑河下游额济纳绿洲做为干旱区绿洲的典型代表，无论在我国还是世界上都具有极其重要的科学研究价值。The measurement of water resources carrying capacity was an important guidance to the sustainable development of arid and semiarid area.
水资源承载力分析计算和评价是干旱半干旱区寻求区域可持续发展道路的重要依据。Generally, the expansion of the oasis in arid land is subjected to the restraints of these thresholds.
干旱区绿洲规模的扩张在总体上要受到资源、环境与生态阈限的制约。As the key production element, land resources have played a very important role in the social economic development in arid northwest region.
对于西北干旱区，土地资源作为一种关键的自然要素，对区域经济发展起着至关重要的作用。Groundwater is an important part of water resources in northwest arid area, it is one of keys to oasis land use.
地下水是西北干旱区水资源的重要组成部分，对绿洲的土地利用有着制约作用。Because of the special nature of their environment, Oasis system is more vulnerable than general arid zone ecosystems.
由于其所处环境的特殊性，绿洲系统比一般的干旱区生态系统更为脆弱。The nodules of these plants were irregular in shape, most of them were white and brown in colour, with thick cortices .
这些植物所结根瘤在外形上多数不规则，以皮层厚和白色、棕色者居多，与非干旱区的根瘤形态显著不同。