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| 1. | Furthermore, we find that old product's marginal value will decrease with the entrance of new products |
| 通过对模型的分析，我们发现老产品的边际价值随着库存量和剩余销售时间的减少而递减，且随着新产品的进入市场，老产品的边际价值也会减少。 |
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| 2. | Geologists, in contrast to some nongeologists, believe that knowledge of the concepts of geology can help to find |
| 地质学家相对于非地质学家来说，更相信了解地质概念有助于寻找石油。而且，常常认为石油地质和石油勘探是同义词，而实际上并非如此。 |
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