Government debt held by the public, excluding obligations to Social Security, totals about $ 5.5 trillion.

不包括社保基金, 公众持有的美国政府债券总额约为5.5万亿美元.

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China is s biggest foreign creditor, holding an estimated $ 1 trillion S. government debt.

中国是美国最大的国外债权人, 据估计约持有1万亿美国政府债券.

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