0 a disease which children who do not have enough vitamin D can suffer from, in which the bones become soft and not shaped correctly -- 佝僂病
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。