结论换粮预防大骨节病效果显著。
Conclusions It's a useful method to prevent KBD by exchanging grain.
有两种粮食分发的方法可以使用：直接提供食品，和以工换粮或以工换钱。
Two methods for food distribution can be used: providing food directly or using the food-for-work or cash-for-work methods.
进口谷物的石油出口国将会直接以油换粮，低收入谷物进口国在竞争中终将失败。
Oil-exporting countries that import grain would have been trying to barter oil for grain, and low-income grain importers would have lost out.
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