求翻译：该方法基于这样一些假设：贷款组合中任何单项贷款发生违约与否是随机的；每项贷款发生违约的可能性是独立的，因而这个方法假设贷款组合中单项贷款的违约概率分布服从Possion分布。信用风险附加模型的优点在于，它只要求有限的输入数据，基本上只有贷款组合中各组的贷款违约率、违约率波动率和风险暴露，因此贷款损失很容易计算。是什么意思？

The method is based on some assumptions: that the loan portfolio in any single loan default occurs or not is random; the likelihood of default of each loan is independent, and thus this method assumes that the individual loans in the loan portfolio default probability distribution the obedience poss

This method is based on some assumptions: Any individual loan portfolio Loans in default has occurred or not is random; each loan default has occurred is the possibility of independence, and that loans in the portfolio approach assumes that the individual default loan Possion probability distributio

This method based on like this some suppositions: In the loan combination any single item loan has the violation or not is stochastic; Each loan has the violation possibility is independent, thus in this method supposition loan combination the single item loan violation probability distribution obey

The method is based on some assumptions: loan portfolio in any single loan default occurs or not is random; every possibility of loan default is independent, so this method assumes that the loan portfolio of individual loans in default probability distributions subject to Possion distribution. Advan

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