U. s. Treasuryobligations 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。
2
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。
3
This standoff risks delaying an essential increase in the legal limit on Treasury debt, calling into question America's ability to honour its obligations.