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。

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The non-data descriptor is likely to be used to return a callable object.

非数据描述符最常用于返回一个可调用对象。

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High Yield bonds are usually non-callable for about half of life of the bond;

高收益债券通常在期限过半时不可赎回；

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One, the yield to the worst call date is much better than yield to maturity of a non-callable bond (aka, bullet bond).

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The dividends on both new kinds of shares would be paid in perpetuity, and the securities would be non-callable (although the government could, of course, always go into the open market and buy them back).

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Both issues are non-callable.

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