一旦需要购买汽轮机上用的新轴承，或者石油，或者化肥，而拿不出外汇来，那简直是这些国家担当不起的一种风险。
Not to have the foreign exchange to buy a new bearing for a steam turbine, or oil, or fertilizer, when the need arises is a risk they simply cannot afford.
这也强调了关于有机农业的一个普遍的观点——即便是对喷洒化肥或者采用基因物种不加任何限制，要养活数十亿人口已属不易。
It also highlighted a common critique of organic farming: It's already hard to feed billions of people, even without rules against spraying chemicals or swapping genes.
农民为了使作物长得更好而给土壤施化肥或者为了杀死害虫而喷撒农药。
Farmers add fertilizer to the soil to make plants grow better, or spray poison to kill plant pests.
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