0 a private joke that can only be understood by a limited group of people who have a special knowledge of something that is referred to in the joke -- (只有圈子里的人才能懂的)内部笑话
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。