Boron has been regarded as one of the environmental estrogen chemicals which should be studied with more efforts in America.
美国已将硼列入环境雌激素重点研究化学品之一。
Experts cannot say for certain what is behind the shift, but several factors are likely to blame, including increased rates of obesity and environmental chemicals that mimic the effects of estrogen.
专家们现在不能确信是什么导致这种变化，但是包括不断增加的肥胖率和作用相当于雌激素的环境的化学物质的影响等一些因素可能是其中原因。
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