环境随机变化。环境条件非确定性的、不可预见性的变化会导致平衡密度的变化。

Environmental stochasticity, This is a nondeterministic, unpredictable variation in the environmental conditions, resulting in a changing equilibrium density.

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虽然大多数公司只做口头功夫，仅宣称“除去不可预见的情况”，预计条件是不变的，但至少他们有一份预期报告。

Although the majority pay lip service by simply declaring that "barring unforeseen circumstances", they expect conditions to remain the same, at least they have a forward-looking statement.

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对于许多管理上的问题，立法机关既不能预见有关机构应采取的行动，也不能随着条件的改变而不断修正法定的指令。

For many regulatory problems, the legislature can neither foresee what actions the agency should take, nor constantly revise the statutory mandate as conditions change.

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But in fact, logically speaking at least, variability, although it's a requirement for unpredictability, doesn't guarantee unpredictability.

但实际上，至少在逻辑上讲，可变性虽然是不可预见性的必要条件，但是不可预见性却不是必然。

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