0 as stated by the law -- 依法,按照法律
Children under 16 are not legally allowed to buy cigarettes. 法律規定16歲以下未成年人不得購買香煙。
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。