Some experts say the findings raise questions because the IQ losses were similar in the two groups despite the eightfold difference in their average level of exposure.

一些专家对这项发现提出问题因为尽管暴露的环境中多环芳烃含量有八倍的不同但是智商值的减少却相似。

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Current normal background exposure is not expected to affect human health on average.

目前，正常环境的接触总体上不会影响人类健康。

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The average American receives 360 millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)

平均一个美国人每年要受到360毫雷姆(毫雷姆：核辐射量单位)的辐射，其中300毫雷姆来自自然界，60来自人类活动。

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The average exposure to organophosphates is lower today than it was when these studies began a decade ago.

CNN: Pesticide exposure in womb may hurt your child's IQ

It is also possible to bend the risk curve using other ETFs such as QQQ for Nasdaq exposure, DIA for Dow Jones Industrial Average exposure, EEM for emerging markets exposure, or even non-equity ETFs such as GLD for gold exposure.

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In Japan, the average equity exposure is far lower, where bonds account for 48.8% of funds.

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