underlying mortgage是什么意思

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underlying mortgage
[金融] 优先抵押
第一担保抵押
The bank's mark-to-model approach to valuing its subprime-related holdings hadbeen based on payments data from the underlying mortgage loans.
银行估量其与次级债相关的股票所用的按模型定价办法是基于第一担保抵押存款的支付数据上的.
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