0 a coloured substance, usually contained in a pencil, that is put in a line just above or below the eyes in order to make them look more attractive -- 眼线液;眼线笔
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。