以下为句子列表:
英文: The results show: firstly, NR is product of price inelasticity of demand; Secondly, NR and SR can be substituted to a certain extent, but not completely from the perspective of the economics.
中文: 研究结果表明:天然橡胶属于需求缺乏弹性的商品;从经济学角度证明天然橡胶与合成橡胶在一定程度上可以相互替代。
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