0 the thick hair that covers the bodies of some animals, or the hair-covered skin(s) of animals, removed from their bodies -- (動物的)毛,毛皮
1 a hard pale grey substance that can form on the inside of water pipes, kettles, etc. -- 水垢
2 a greyish covering on the tongue, caused by illness or by smoking cigarettes -- 舌苔
3 If water pipes, kettles, etc. fur, a hard grey substance forms on the inside. -- (水管、水壺等)生水鏽,結水垢
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。