他的辩词（根据目前证据似乎可信）是：银行把它的偷天换日的做法遮掩得天衣无逢，全世界任何地方的监管人员都无法掌握。

His defense, which seems credible on the evidence so far, is that the bank masked its skullduggery so completely that no regulator anywhere in the world could get a handle on it.