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The second law of thermodynamics is a physical law that is not symmetric to reversal of the time direction. This does not conflict with symmetries observed in the fundamental laws of physics (particularly CPT symmetry) since the second law applies statistically on time-asymmetric boundary conditions.[78] The second law has been related to the difference between moving forwards and backwards in time, or to the principle that cause precedes effect (the causal arrow of time, or causality).[79]
The second law of thermodynamics is a physical law that is not symmetric to reversal of the time direction. This does not conflict with symmetries observed in the fundamental laws of physics (particularly CPT symmetry) since the second law applies statistically on time-asymmetric boundary conditions.[78] The second law has been related to the difference between moving forwards and backwards in time, or to the principle that cause precedes effect (the causal arrow of time, or causality).[79]
热力学第二定律是<font color = 'red'><s>与时间方向逆转不对称的物理定律</s></font><font color = 'blue'>在时间方向上不对称的物理定律</font>。这与在物理学基本定律中观察到的对称性概念（特别是CPT对称性）<s>并</s>没有冲突，因为第二定律在统计上适用于时间非对称边界条件。第二定律与时间向前和向后移动之间的差异有关，或者与<font color = 'red'><s>导致先于效果</s></font><font color = 'blue'>原因先于结果</font>的原理（时间的因果关系或因果关系）有关。
The second law has been proposed to supply a partial explanation of the difference between moving forward and backwards in time, such as why the cause precedes the effect (the causal arrow of time).
The second law has been proposed to supply a partial explanation of the difference between moving forward and backwards in time, such as why the cause precedes the effect (the causal arrow of time).
第二定律被提出来<font color = 'red'><s>部分</s></font><font color = 'blue'>侧面</font>解释时间向前和向后移动的区别，例如为什么原因先于结果(因果关系的时间箭头)。
==Irreversibility==
==Irreversibility==