但是，同时我们也知道，物质的原子理论。

But, at the same time, we do know about the atomic theory of matter.

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现在化学符号则表示化学中物质的原子理论的系统性。

The present symbols express the system set out by the atomic theory of matter.

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现在化学符号则表示化学中物质的原子理论的系统性。

The present symbols express the system set out by the atomic theory of matter.

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