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1·In this paper, we develop a two-period model in which a producer decides to sell or rent his durable good having a nondurable good.

文章建立了一个两期数学模型，其中一个耐用品厂商有可能还拥有一种非耐用品。

2·Along with population increase, they to the grain, the non-staple food product as well as the nondurable consumer goods quantity's demand increase unceasingly.

随着人数的增加，他们对粮食、副食品以及日用消费品数量的需求不断增多。