求翻译：物理化学的主要理论支柱是热力学、统计力学和量子力学三大部分。热力学和量子力学分别适用于宏观和微观系统，统计力学则为二者的桥梁。原则上用统计力学方法能通过个另分子、原子的微观数据来推断或计算物质的宏观现象。是什么意思？

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