但是灭绝的速度同一个恒定的常数有着相当大的距离。

But the rate of extinction is far from constant.

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然而经典的生产库存模型并不考虑容量可变性，而是假定机器在单位时间内的生产量是恒定的常数。

However, the classical production inventory models do not take volume flexibility into account, machine production rate is usually assumed to be a constant.

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这篇报告描述了某一个人为假定的自然界的基本物理常数，似乎并不是一直保持恒定不变。

The report describes how one of the supposed fundamental constants of Nature appears not to be constant after all.

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