The researchers think that the blood loss reduces iron levels.

研究人员认为失血会降低铁的含量。

Despite taking prenatal vitamins with iron, 58% of the women had iron levels below normal.

尽管孕妇在产前服用了含铁维生素，但仍有58%的孕妇体内铁含量低于正常水平。

Those babies whose umbilical clamps had been applied after three minutes had, on average, iron levels 45% higher than those whose cords had been clamped immediately.

那些脐带在三分钟后才被钳住的儿童，体内的铁元素平均水平要比采用速钳法的儿童高出45%。

Iron studies show low serum iron levels, normal to low serum iron transferrin or total iron binding capacity, low transferrin saturation, and normal or increased serum ferritin levels.

铁质研究会显示血清铁水平下降、血清转铁蛋白或总铁结合力正常或下降、转铁蛋白饱和度下降，以及血清铁蛋白水平正常或增加。

Bradley Peterson, director of the Institute for the Developing Mind at Children's Hospital Los Angeles in California, wanted to see why low iron levels in children are correlated with lower IQ and poor concentration.

加州洛杉矶儿童医院心智发展研究所主任布拉德利·彼得森想了解为什么儿童体内铁含量低与智商低和注意力不集中有关。

Liam happens to run a lot, so his iron requirements are higher, but in the last 3 months of his diet experiment, despite having taken supplements and using other strategies for increasing his iron, his iron level halved...again.

利亚姆经常跑步，所以他对铁的需求量更高，但是在他饮食实验的最后三个月里，尽管他服用了补充剂和其他方法来增加他的铁含量，他的铁含量还是减少了一半。