原文: Major banks are intensifying their efforts to reduce their risk assets by securitizing and selling their credit to prevent their capital adequacy ratio, an index that shows their business soundness, from declining.
译文:各大银行正加紧努力，通过将信贷证券化和出售来降低风

原文: Major banks are intensifying their efforts to reduce their risk assets by securitizing and selling their credit to prevent their capital adequacy ratio, an index that shows their business soundness, from declining.
译文:各大银行正加紧努力，通过将信贷证券化和出售来降低风险资产，以防止作为一项显示其业务稳健的指标的资本充足率下降。

修改:主要银行都在加大力度，以债权证券化及出售信贷的方式，来规避其体现企业经营健全性指标的资本适足率下滑，从而降低其风险资产。