0 a person who trades in something -- 商人,商贩
a second-hand car dealer 二手汽车经销商
an antiques dealer 古玩商
drug dealers 毒贩
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。