怀勒说，科学家尚未对这种山药的营养成分及食用益处进行研究。尽管安格那山药深受欢迎，但产量稀少。
Wheeler said scientists have not yet studied the yam's nutritional value to see what benefits the plant offers as a food crop—and despite its popularity, pickings are already slim.
如果采用不恰当的方式，那么即使粮食产量增长，也会问题多多，因为某些地区的水源已经越来越稀少，而提高粮食产量会使其更稀少。
Even if the rise in output comes about but in the "wrong" way, there could be problems, since water in some areas is growing scarce and increasing food output will make it scarcer.
为了提高产量而运用油性化肥，杀虫剂，除草剂的努力随着石油的稀少而不能够继续下去，而且在任何情况下，它对土地的影响是有危害的。
The attempts to increase production with the use of oil-based fertilizers, insecticides, and herbicides cannot continue as oil grows scarce, and in any case, its effects on the land are harmful.
为了提高产量而运用油性化肥，杀虫剂，除草剂的努力随着石油的稀少而不能够继续下去，而且在任何情况下，它对土地的影响是有危害的。
The attempts to increase production with the use of oil-based fertilizers, insecticides, and herbicides cannot continue as oil grows scarce, and in any case, its effects on the land are harmful.
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