0 a place on a road where the police use special hidden equipment to see if drivers are going faster than is allowed in a particular area -- 汽车超速监视区
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。