But the vast population of large cities cannot be fed with food produced in their immediate vicinity.
但是，大城市的大量人口不可能靠它们临近地区生产的食物来养活。
But minutes before allowing the birds to recover their stash, the researchers fed the birds to satiety with that second food-the one they had already stored.
但在让鸟重新找寻储备的食物前几分钟，研究人员们又用这些鸟已经储备的第二种食物将这些鸟喂得饱胀。
Children not suffering from such a grave disease could be fed with half that amount - not on a diet like ours, but on plain, basic, life-sustaining food.
没有遭到那种严重疾病的孩子可以用那个数目的半数糊口——不是们那样的食物，只是一般的、基本的、维持生命的食物。
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