袁博士寻求一种在不扩大种植面积的情况下提高水稻产量的方法。
Dr Yuan searched for a way to increase rice harvest without expanding the area of fields.
现在，他不仅把所有的6公顷土地都用来种马铃薯，还租来1.6公顷以扩大种植面积。
Now he plants potatoes on all of the six hectares he owns and another 1.6 he has leased.
在过去15年里，美国的农场主们看到了两个截然不同的发展趋势：虽然转基因作物的种植面积扩大了，但对有机作物的市场需求却有了小幅的增加。
America's farms have seen two divergent trends over the past 15 years: the rise of GM crops and, on a smaller scale, an expanding market for organic products.
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