Free expansion of a gas causes it to cool.

气体的自由膨胀会使其温度降低。

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The expression of free energy is deduced by the method of cluster expansion.

利用“集团展开”方法，导出了系统的自由能；

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The full free energy expansion was proposed.

本文给出了自由能的完整表达式。

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The full free energy expansion was proposed.

本文给出了自由能的完整表达式。

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