U. s. Treasury obligations eligible for immediate purchase by commercial Banks, typically those which are due or callable in 10 years or less.

商业银行有责任立即购买的国库债券，以10提年或更短时间到期或可提前偿付的债券为典型。

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Technically, Treasury is not guaranteeing the twins' obligations, but the chance that it would tolerate a default has dropped from small to near zero.

理论上说，国资局并没有完全保证两家公司的义务，但是两家公司违约的几率降到了基本为零。

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This standoff risks delaying an essential increase in the legal limit on Treasury debt, calling into question America's ability to honour its obligations.

而这一僵局将加大耽搁法律上允许的国债本必要增长的风险，而这就使人们对美国履行其义务的能力提出质疑。

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Just as my ladder hits the wall of the castle the S and P minions come along to push it back by downgrading US treasury obligations.

FORBES: S and P Downgrade - Case Study

It is not clear what the legal priority is among the Treasury's obligations, whether contractual such as bond debt or statutory such as social security.

ECONOMIST: Talk of America defaulting on its debt is just that

It also put off until March 1 the mandated spending cuts from a 2011 agreement that increased how much money the Treasury could borrow to meet financial obligations.

CNN: Debate on spending cuts seeks blame, not solutions