For the T-bond contract, any Treasure bond that has at least 15 years to the nearest call date or to maturity (if non-callable) can be used for delivery.
对于国债期货，任何距最近的赎回日或到期日（假如不可赎回）长达至少15年的国债可用于交割。
2
The 30-year T-bond stands at 2.82%, and three-month Treasury bills were sold last week for a yield of just 0.05%.
30年期国债收益率为2.82 ％ ，3个月国库券，上周实际收益率仅为0.05 ％。
3
Of course, T-bond futures can be very volatile and can trade several tics in either direction in a matter of seconds.