求翻译：20世纪80年 代以来,受债务危机的影响，各国银行普遍重视对信用风险的管理和防范，工程化的思维和技术逐渐被运用于信用风险管理的领域，产生了一系列成功的信用风险量化管理模型。现代信用风险的计量模型按其计量的风险层次分为三种类型：一是单个交易对手或发行人的计量模型，二是资产组合层次的计量模型，三是衍生工具的计量模型。是什么意思？

Since the 1980s, the debt crisis, national banks generally value the credit risk management and prevention of engineering thinking and technology is increasingly used in the field of credit risk management, a series of successful credit risk quantitative management model. Modern credit risk measurem

Century 20 80 generation, since the debt crisis, banks generally pay attention to the credit risk management and prevention of the thinking, engineering and technology has been applied to the credit risk management has a series of successful credit risk quantitative management model. The modern cred

Since 1980s, the debt crisis influence, the various countries' bank are taken generally the credit risk management and the guard, the project thought and the technology are utilized gradually in the credit risk management domain, have produced a series of success credit risk quantification managemen

In the 1980 of the 20th century, the impact of the debt crisis, banks generally pay attention to the management and prevention of credit risk, thinking of engineering and technologies being used in areas of credit risk management, has produced a series of successful credit risk management model. Mod

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