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。
Thank you for your presents, it will be my treasure in all my life. The T-shirt which you have signed will also be treasured seriously.
谢谢你们的礼物，他们将是我永远的宝藏，当然还有那件我让你们签过名的汗衫。
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