三分之一的非洲大陆面临着荒漠化的威胁。
从1991年3月到1993年3月,第三阶段的重点是对这些活动做精细的改进并且使其制度化。
Phase III, from March 1991 to March 1993, focused on the refinement and institutionalization of these activities.
除了奶牛养殖和工业作物种植,荷兰经济的第三部分反映了农业现代化的方式——园艺。
In addition to dairy farming and cultivating industrial crops, a third sector of the Dutch economy reflected the way in which agriculture was being modernized—horticulture.
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