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.
除法律、行政法规另有规定外，承运人没有对前款规定的资料或者文件进行检查的义务。
The carrier is under no obligation to check such information or documents unless otherwise provided by laws and administrative rules and regulations.
在得到最后的财产分割协议前，双方有义务交换所有财产方面的文件。
It is compulsory that both parties exchange all relevant financial documents before reaching any final property settlement.
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