The more complex expression is the Atom expression.

比较复杂的表达式是Atom表达式。

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We have seen this journey from a single atom to a complex protoplasmic biological phenomenon called life.

我们看到，这次旅行已经从一个简单的原子抵达我们称之为生命的最基本的生物现象。

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Heme, a complex heterocyclic compound, is an organic molecule derived from porphyrin with an iron atom at the centre.

血红素(一种复杂的杂环化合物)是来自中心含铁原子的的一种有机分子。

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