This vision of the founders served as a basis for asserting that freedom was a national moral imperative, and that the United States Constitution was an antislavery document.

国父们的这种远见成为了主张自由是国家道德义务的基础，美国宪法是一份反奴隶制的文件。

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This association states that each document can only be associated with (belongs to) a single user.

这种关联表明，每个文档只能与一个用户关联(即只能属于一个用户)。

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