garbage in, garbage outgarbage out garbage in used to say that if the data (=information) you put into a computer is bad, the results you get back will be bad, even if the computer program you use works properly 无用输入,无用输出〔即如果向计算机中输入错误数据,那么输出的也是错误数据〕. → garbage in, garbage out at garbage(1)