0 written above or below a letter to change its pronunciation -- 表示变音的
a diacritical mark over the e 字母 e 上方的变音符号
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。