俚语：Dead duck/死鸭子

　　定义：any person or thing that is doomed to fail or die; to have failed or died, ( usually used figuratively)注定失败或死亡的人或事；失败或死亡，(一般用做比喻用法)

　　例句：I'm a dead duck if I don't pass my chemistry examination.要是没通过化学考试的话，我死定了。