Define a static class to contain the extension method.

定义静态类别以包含扩充方法。

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The extension method is explicitly designed into the original schema.

在原始模式中显式设计extension方法。

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The extension method must be designed into each enumerated list at design time.

在设计阶段，必须在每个枚举列表中设计extension方法。

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Issuers would achieve this stability through loan extension and expiration operations (the major, long-term method) or currency trading (the minor, day-to-day method).

FORBES: Private Currency Competition Is The Monetary Answer