牛顿力学的时间可逆性与宏观热力学过程不可逆性的矛盾，很长时间以来一直是物理学和哲学中争论最多的问题之一。
The contradiction between temporal reversibility of Newton mechanics and irreversibility of thermodynamic process has long been one of the most frequently debated problems in physics and philosophy.
我们可以实际地感到时间的流逝。 时间严格的按照它既定的规律运行，即持续性与不可逆性。
We can practically feel it ticking away, marching on in the same direction with horrifying regularity.
本文主要讨论双线性时间序列模型的平稳性与可逆性。
In this paper, we discuss the stationarity and invertibility of a bilinear model.
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