The benefits are greatest for less privileged homes—that is, where their mother did not have a college degree.

在母亲没有大学学历的不富裕家庭，家庭完整就是最大的优势。

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"It was a privileged realm ... but the homes were not ostentatious, and there were no high hedges or long drives shielding them from view, " Isaacson wrote.

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