to be the worst culprit是最恶劣的罪犯；是罪魁祸首
If this is about producing weapons of destruction, I think that America is the worst culprit.如果是说制造杀伤性武器, 那我认为美国是罪魁祸首。
Nearly a third of dinner party hosts cheat by using ready-made meals. Men are the worst culprits - but a growing number of women also cheat.几乎三分之一举办宴会的人都会欺骗来宾, 使用现成的餐点。男人是这件事的罪魁祸首——然而越来越多的女人也这么做。