4.Is there a credible alternative to the nuclear deterrent?
是否有可以取代核威慑力量的可靠法?
5.to blame the debacle on the antics of a rogue trader is not credible—it doesn't stack up.
失败归咎于无赖商人哗众取宠的行为是不可信的,这与事实不符。
6.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.