In nature, matter and its movement are primary, while time is just a concept and a method for measuring the rate of material movement. μ0ε0 is an interesting pair of physical quantities that can be a constant when measured directly, and a variable when measured indirectly. Research has found that, μ0ε0 affects the rate of motion of all substances within a local area. From the perspective of influencing the rate of material motion and reflecting the rate of material motion, μ0ε0 is correlated with the time process. because μ0ε0 The value of can be large or small and always a positive number greater than zero, so the process of time can be fast, slow, and irreversible. Like other physical concepts, time also has a certain scope ofapplication and is not effective for studying all physical phenomena.

在自然界中，物质和物质运动是第一性的，而时间只是一个概念，只是人们量度物质运动速率的一种方法。μ0 ε0是一对有趣的物理量，当直接测量时，它是常数，当间接测量时，它又可以是变数。研究发现，μ0 ε0影响着局域内所有物质运动的速率。从影响物质运动速率和反映物质运动速率方面看，μ0 ε0与时间进程具有相关性。与其它物理概念一样，时间也具有一定的适用范围，并非对研究的所有物理现象均有效。