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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The essence of polar conversion is that organic compound reflects the carbon atom electricity in the centre and changes, kiss the electricity or kiss the core course changing.

极性转换的本质是有机化合物反应中心碳原子电性发生转换，即亲电性或亲核性发生转换的过程。

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The cultural and recreational centre is not an isolated individual but an organic component of a city.

文化娱乐中心不是孤立的建筑单体，而是城市的有机构成部分。

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Then an organic bean sprout farm in northern Germany - the centre of the outbreak - was thought to be responsible.

BBC: E. coli: Germany says worst of illness is over