仔细研究穷人的生育行为是很重要的，因为有大量关于婴儿高死亡率的“替代效应”的文献。
A closer look at the fertility behavior of the poor is important because of the extensive literature on the "replacement effect" of high infant mortality.
这种论调模糊了一个论点，即：对于美国与以色列之外的先进国家而言，“替代生育率”与婴儿的低出生率，二者必居其一。
This obscures the point: for every big advanced country besides America and Israel, the alternative to “replacement rate” fertility is a baby bust.
不过，这个发现令人担忧，非常有必要找出婴儿用品材料的替代方案。“杜克大学的环境化学家、首席研究员Heather Stapleton，如是说。”
Still, the findings are worrisome enough that it's worth seeking out alternatives, said lead researcher Heather Stapleton, an environmental chemist at Duke University in Durham, n.c..
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