另一项发表在《经济学与统计学评论》上的研究报告称，父母所付出的努力是十分重要的。

Another study, published in the Review of Economics and Statistics, reports that the effort put forth by parents is extremely important.

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有趣的是，父母对教育的态度似乎并未反映出他们自己的教育背景，而反映了他们的观念，即教育对晋升十分重要。

Interestingly, parents' attitudes toward education do not seem to reflect their own educational background as much as a belief in the importance of education for upward mobility.

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调查人员指出，对于那些喂以婴儿食品的婴儿，父母等到4个月之后才给婴儿食用固体食物，这一点十分重要。

For those babies who are raised on formula, it seems to be especially important that parents wait until babies are at least four months old to feed them solid foods, researchers say.

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