shrink back before difficulties 基本例句 知难而退 In his work he often shrinks back from difficulties.他在工作中常常知难而退。 If you imagine trying to solve all the world's problems at once,though,you're likely to quit before you finish rolling up your sleeves.假定你想在片刻之间解决世上的所有问题,那么你有可能在卷起袖子准备大干一场前就知难而退。