0 the price at which goods are sold to shops by the people who produce them, rather than the price which the customer usually pays in the shop -- 批发价
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。