0 something that has size but no direction, such as a quantity, distance, speed, or temperature -- 标量的(只有大小没有方向的,如数量、距离、速度或温度)
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。