他们通过复杂的金融工具埋葬这些坏账，埋葬得如此之深以至于没人知道这些坏账究竟有多坏，也没人能够很快地为它们重新定价。
They buried the bad mortgages in complicated instruments, buried them so deep that no one knew exactly how badly they were impaired, and no one could calculate how to re-price them quickly.