假设农夫史密斯不喜欢吃鱼，但是渔夫琼斯又想买小麦，他就不得不去寻找另一种史密斯接受的商品，比如黄油，不是为了他自己用，而是为了和史密斯进行交换。

Suppose that Smith dislikes fish, but Jones, a fisherman, would like to buy his wheat. Jones then tries to find a product, say butter, not for his own use but in order to resell to Smith.

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小麦穗发芽是一种世界性的气候灾害，它严重影响小麦的产量、品质和种用价值。

Wheat pre-harvest sprouting is a worldwide climate disaster. It effected wheat yield, quality and its seed value severely.

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因此，用同一种小麦制成的专利面粉，长专利粉要比短专利粉含有比例较高的蛋白质。

Thus longer patent flours have a higher percentage of protein than shorter patent flours made from the same type of wheat.

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