芬德雷格鲁伯特定理告诉我们，某一产业发生技术进步的话，在商品价格不变的情况下，该产业的生产会扩大；

The Findlay Grubert theorem tells us that an industry will see expanded production when it makes some technical advance and the price of the products remains the same.

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布鲁·德斯·阿尔弗雷德，哈格瑞福。莫尼卡，金。鲁伯特提供了有价值的建议。

Alfred Broaddus, Monica Hargraves, and Robert King have provided valuable comments.

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艾玛·沃特森和鲁伯特·格林特将继续饰演赫敏·格兰杰和罗恩·韦斯莱。

Emma Watson and Rupert Grint reprise their roles as Hermione Granger and Ron Weasley.

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艾玛·沃特森和鲁伯特·格林特将继续饰演赫敏·格兰杰和罗恩·韦斯莱。

Emma Watson and Rupert Grint reprise their roles as Hermione Granger and Ron Weasley.

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