0 a small, round object, usually white, that forms around a grain of sand inside the shell of a sea creature, especially an oyster. Pearls are valuable and are used to make jewellery. -- 珍珠
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。