以下为句子列表：
英文: The text calculated the price elasticity of demand of NR (natural rubber) and the cross elasticity of demand of NH and SR by establishing the model of NR's demand function.
中文: 摘要通过建立天然橡胶需求函数模型，估算了天然橡胶的需求弹性系数和天然橡胶与合成橡胶的替代弹性系数。
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英文: This article meaning is the discussion studies the market with mathematics method the change rule-precisely calculates the demand price elasticity to decide the commodity reduces prices or raises the price the behavior.
中文: 摘要探讨用数学的方法研究了市场的变化规律－即精确的计算需求价格弹性来确定商品的降价或提价行为。
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