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。
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.
非常简单，打开文件，按制，跟指示走，没有什么特别！
Very simple, open the file, click the command button, follow the instruction, nothing special!
他速制了文件，但是都是关于同一个主题。
He churns out papers, but they are all about the same topic.
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