对物理属性的真实量度，如温度或能量，按惯例加入到模式中，保证模式尽可能与真实世界相一致。

Actual measurements of physical properties, like temperature or energy, are routinely folded into the model to keep the model as close to the real world as possible.

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它用方差之类的量度来描述风险，然而最真实的风险是从单独的一个观测结果发生的。因此方差是一种无法描写真实风险的易变状态。

It USES metrics like variance to describe risk, while most real risk comes from a single observation, so variance is a volatility that doesn't really describe the risk.

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