0 (of rock) changed into a new form and structure by very great heat and pressure -- (岩石)變質的(因高溫、高壓變成了一種新的形狀和結構的)
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。