作用力的局限性体现在光速是有限的，体现在场的平方反比定律之中［4］，还体现在宏观统计效应上，如反应速度和音速等。
Locality of action shows itself in the finite speed of light, in the inverse square law of fields, and in macroscopic statistical effects, such as rates of reaction and the speed of sound.
统计力学：物理学的分支，将统计学的原理和方法与经典力学和量子力学的定律结合起来。
Statistical mechanics: branch of physics that combines the principles and procedures of statistics with the laws of both classical mechanics and quantum mechanics.
恩格尔定律来源于统计学，并且经过了世界各地的长期证明，这一事实本身就具有最大最广泛的研究样本。
Engel's law roots in statistics, and through long-term proof around the world, such a fact itself is just the largest and most extensive research specimens.
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