以下为句子列表：
英文: Informal marriage and cohabitation were so common in early 19th –century America that one judge estimated that one-thirds of all children were born to couples who were not legally married.
中文: 19世纪初，非正式婚姻和同居在美国盛行，一名法官估计，当时大约三分之一的儿童父母都是没有合法结婚的。
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