0 If the amount, rate, or quality of something falls off, it becomes smaller or lower. -- (数量)减少;(比率)下降;(质量)降低
1 a reduction in the amount, rate, or quality of something -- 下降;减少
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。