If you change the composition, you change the properties. But this is different.

如果你改变组成成分，你就能改变属性，但是这是不同的。

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They can change the properties.

他们可以改变物质的属性。

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It means that the properties of the system, the properties that describe the system, don't change in time or in space.

它的意思是指，用以描述系统的性质，不随时间或空间改变。

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If you were to make that change you would find that the molecule now has completely different biological and chemical properties.

如果要做出这样的变化,你会发现,分子的生物形状,和化学性质完全改变了。

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And so the set of properties that describes system equilibrium doesn't change.

这些描述系统的属性,平衡是不变的。

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