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Abstract：
In the debate about the direction of time in physics, the concept of time reversal has been central. Tradition has it that time-reversal invariant laws are sufficient to state that the direction of time is non-fundamental or emergent. In this paper, we review some of the debates that have gravitated around the concept of time reversal and its relation to the direction of time. We also clarify some of the central concepts involved, showing that the very concept of time reversal is more complex than frequently thought.
摘要：
在关于物理中时间方向的争论中，时间逆转的概念一直是核心。传统上，时间反转不变定律足以说明时间的方向是非基本的或紧急的。在本文中,我们回顾了一些围绕时间逆转概念及其与时间方向的关系的辩论。我们还澄清了所涉及的一些核心概念，表明时间逆转的概念比人们经常认为的要复杂得多。
