求翻译：历史成本法建立基础的条件，一是币值稳定假设，二是社会平均生产率不变假设，二者共同构成历史成本原则得以存在的前提条件。是什么意思？

To establish the basis of historical cost conditions, one currency stability hypothesis , the second is the social average productivity change assumption, the two together constitute the historical cost principle to the existence of preconditions.

Historical Cost law establishing the basis for conditions, the stability of the currency assumptions, 2 the social average productivity unchanged assumptions, 2 are a common form historical cost principle the prerequisites.

The historical cost law establishment foundation condition, one is the currency value stable supposition, two is the social average performance invariable supposition, the two together constitute the prerequisite which the historical cost principle can exist.

Historical cost method for establishing basic conditions, one is the currency stabilization, the other is the average productivity of social assumption, which together constitute a prerequisite for the historical cost principle exists.

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