确信无疑

确信无疑
bet one`s bottom dollar 确信
sell like hot cakes 很畅销；
Look before you leap. 三思而后行；
Haste makes waste. 欲速则不达；
Easy come, easy go. 来得快，去得快；
Practice makes perfect. 孰能生巧；
drive sb. to the wall 使某人发疯/受不了;使某人束手无策