There are two methods in studying metaphysics. One is the positive method, and the other is the negative method.

形而上学有两种方法，即正的方法和负的方法。

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The maintenance of the Aaa with a negative outlook into 2014 is highly unlikely unless the method adopted to achieve debt stabilization involved a large, immediate fiscal shock with a resulting unstable economic situation.

FORBES: Moody's Says U.S. Has Until End Of 2013 To Save AAA Rating