他们甚至也不知道这些孩子们的父亲是否当着孕妇吸烟，或者当孩子降生后，当他们的大脑还处于发育期时，双亲中是否有人吸烟。
They also didn't know which fathers smoked while the children were in the womb, or if either parent smoked after the babies were born, when their brains would still have been developing.
他们甚至也不知道这些孩子们的父亲是否当着孕妇吸烟，或者当孩子降生后，当他们的大脑还处于发育期时，双亲中是否有人吸烟。
They also didn't know which fathers smoked while the children were in the womb, or if either parent smoked after the babies were born, when their brains would still have been developing.
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