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倉庫里沒有積蓄備用的糧食，一旦遇到饑荒之年，就很難應付了。

Efficient market theory is correct in that there are no gross inefficiencies， but we look at anomalies that may be small in size and brief in time.

采礦業必須在不影響效率的情況下發展以滿足可持續發展的需求。