为什么我们需要一个食物周期表？
玉米，是世界上仅有的三种主食作物之一，世界人口近一半的日常卡路里摄入都依赖于玉米。 Image: 路透社/Marcos Brindicci
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世界经济论坛是一个独立且中立的平台，以上内容仅代表作者个人观点
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