按照比较优势理论，我国应净进口粮食这一土地密集型产品。
According to the theory of comparative advantage, China should be a net importer of grain.
加入WTO后，我国农产品中的粮食、油料、棉花等土地密集型作物处于比较劣势地位，生产成本明显高于国际市场；
Entry WTO, the compared advantages of land-concentrated agri-product such as grain, oil and cotton are decreased gradually, and their product cost is higher then the cost of international market.
除此之外，放弃劳动密集型的粮食生产，解放了土地和劳动力，形成了更高效的农业部门。
Apart from this, being able to give up labor-intensive grain production freed both the land and the workforce for more productive agricultural divisions.
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