求翻译：During 2000 and 1999, the Company sold trade receivables to Qualifying Special Purpose Entities in revolvingperiod securitizations. The Company retains servicing respons ibility relating to the sold receivables. Solely for the purpose of credit enhancement from the perspective of the Spas, the Company retains an interest in the sold receivables (retained interest). These retained interests are initially measured at estimated fair values, which the Company believes approximate historical carrying values, and are subsequently measured based on a periodic evaluation of collections and delinquencies.是什么意思？

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