有些国家的增长和收入迅速提高，但其他国家的变化仍然不大。
Growth and income for some nations has risen dramatically, but for others it is still flat.
人口增长和收入的提高，伴随着对食物喜好的改变都增加了对畜产品的需求。
Growing population and incomes, along with changing food preferences are increasing the demand for livestock products.
世界人口的不断增长和收入的提高都导致对肉类消费有更高的需求，但同时对扩大畜牧生产的空间造成限制。
The steadily growing world population and increasing incomes creates higher demand for meat, but at the same time leaves limited space for expansion in livestock production.
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