All those superstitious practices are as dead as a doornail.那一切迷信习俗早已成了僵尸。The old captain was dead as a doornail.老船长确实已经死了。The plants are all dead as a doornail.这些植物全死了。The deal is dead as a doornail.这笔生意彻底告吹。The negotiations are as dead as a doornail.谈判彻底失败了。