0 a system in the UK in which the government collects money from companies and workers and makes payments to people who are too old or ill to work or who have no job -- (英國的)國民保險制度
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。