当然知道。钢是以铁为主要成分的一种合金，它含有少量的碳和一些其他元素。
Sure. Steel is an alloy of the element iron with a small amount of carbon and some other element.
由于产前维生素补剂中的铁元素和其他因素的影响，导致孕期便秘情况的产生。
Because the iron in prenatal vitamins and other factors may cause constipation during pregnancy, try to consume more fiber than you did before you became pregnant.
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