Animal Farm is set in an unspecified time period.

《动物农庄》的故事发生在一个时间不是很明确的时期。

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For example, applications can be written to use interfaces with the actual implementations left unspecified until run time.

例如，在编写应用程序以使用接口时，可以到运行时才指定其实际实现。

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At some unspecified later time, when the subject's state changes, the subject notifies the observer of the change event with the update method callback.

在随后某个未知的时候，目标对象的状态发生了更改，目标对象会使用update回调方法，通知观察者，告知已经发生了状态更改事件。

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Francis will then return to his makeshift home at the Vatican hotel at an unspecified time later in the day.

NPR: Pope Francis Tells Benedict: "We're Brothers"

Cybermart has committed to building out 500 stores (over an unspecified time period) and they are giving Apple special selling locations within them.

FORBES: How Big Could China Be For Apple?

Labour argue that the level of debt is not a problem and can be dealt with by unspecified people at some unspecified time in the future.

BBC: In full: Cameron's economy speech