0 a soft, greyish-white material that does not burn, used especially in the past in buildings, clothing, etc. as a protection against fire and as a form of insulation (= a way of stopping heat from escaping) -- 石棉
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。