• Then, if you weren't quite Aaa, you were Aa and if you weren't quite Aa, you were A and then you could become Ba.

    于是,如果你达不到AAA,你就会是AA,如果你达不到AA,你就会是A,再往下就有可能是BA

    耶鲁公开课 - 金融市场课程节选

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