价格总是所有可利用信息的精确反应。
That prices always accurately reflect all the available information.
证明了随着可利用信息的不断增加，上下近似对概念的描述也更精确。
It is proved that with the accumulation of more available information, the lower and upper approximations will provide a more refine description of the concept.
16项原有研究中，仅有12项包含有足够的可利用信息，但结果还是很特别。
Only 12 of the 16 original studies contained sufficient detail to be used, but the result was remarkable.
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