问题如下图:
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解释:
Collatertrust bon. Mortgage-backesecurities. A coverebonisa obligation backea segregatepool of assets callea “cover pool.”When the assets thare incluin the cover pool become nonperforming (i.e.,the assets are not generating the promisecash flows), the issuer must replacethem with performing assets. 能否下collatertrust bond
这里non-performing是什么意思?