Statistical mechanics: branch of physics that combines the principles and procedures of statistics with the laws of both classical mechanics and quantum mechanics.
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。
Because quantum theory aims at natural laws for microscopic particles, statistical concept (called quantum ensemble) is naturally involved.
因为量子理论探索微粒子的自然规律，自然而然地引入统计概念——所谓量子系综。
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