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.
但是灭绝的速度同一个恒定的常数有着相当大的距离。
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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