0 to start to do or use something bad, especially because you are unhappy -- (尤指因不开心)开始使用(不好之物), 开始做(不当之事)
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
再长的路,一步步也能走完,再短的路,不迈开双脚也无法到达。