0 a sign on a stave (= the five lines on which music is written) that shows that the notes are below middle C (= the C near the middle of a piano keyboard) -- 低音谱号
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。