0 a type of stratus (= flat grey cloud) formed in a wide thick layer at a low level and usually carrying rain -- 乱层云(低空的一种平坦的暗灰色层云,云层厚、面积大,多携带雨水)
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。