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The arrow of time, also called time's arrow, is the concept positing the "one-way direction" or "asymmetry" of time. It was developed in 1927 by the British astrophysicist Arthur Eddington, and is an unsolved general physics question. This direction, according to Eddington, could be determined by studying the organization of atoms, molecules, and bodies, and might be drawn upon a four-dimensional relativistic map of the world ("a solid block of paper").

The arrow of time, also called time's arrow, is the concept positing the "one-way direction" or "asymmetry" of time. It was developed in 1927 by the British astrophysicist Arthur Eddington, and is an unsolved general physics question. This direction, according to Eddington, could be determined by studying the organization of atoms, molecules, and bodies, and might be drawn upon a four-dimensional relativistic map of the world ("a solid block of paper").

'''<font color="#ff8000"> 时间之箭The arrow of time</font>'''是一个假定时间是“单向方向”或“不对称”的概念。此概念于1927年由英国天体物理学家亚瑟·爱丁顿提出的一个普通物理学问题，至今尚未被解决。按照爱丁顿的说法，研究原子、分子和物体的组织既可以确定时间的方向，又可以把它绘制在一张四维的相对论世界地图上(“一整张纸”)。  

'''<font color="#ff8000"> 时间之箭The arrow of time</font>'''是一个假定时间是“单向方向”或“不对称”的概念。此概念源自英国天体物理学家亚瑟·爱丁顿在1927年提出的一个普通物理学问题，但至今仍未被解决。按照爱丁顿的说法，研究原子、分子和物体的组织既可以确定时间的方向，又可以把它绘制在一张四维的相对论世界地图上(“一整张纸”)。  

<ref>{{cite book|title=The scientist as philosopher: philosophical consequences of great scientific discoveries

<ref>{{cite book|title=The scientist as philosopher: philosophical consequences of great scientific discoveries

Physical processes at the microscopic level are believed to be either entirely or mostly time-symmetric: if the direction of time were to reverse, the theoretical statements that describe them would remain true. Yet at the macroscopic level it often appears that this is not the case: there is an obvious direction (or flow) of time.

Physical processes at the microscopic level are believed to be either entirely or mostly time-symmetric: if the direction of time were to reverse, the theoretical statements that describe them would remain true. Yet at the macroscopic level it often appears that this is not the case: there is an obvious direction (or flow) of time.

通常，人们认为，微观层面上的物理过程是全部或部分时间对称的: 即使时间的方向逆转，描述它们的理论仍然正确。然而，在宏观层面上，情况往往并非如此， 时间存在明显的方向(或流动)。

通常，人们认为，微观层面上的物理过程是全部或部分时间对称的。因此，即使时间的方向逆转，描述它们的理论仍然正确。然而，在宏观层面上，情况往往并非如此， 时间存在明显的方向(或流动)。