0 in sports, a player who is used for part of a game instead of another -- (體育比賽中的)替補隊員
1 a ship that can travel under water -- 潛艇
a nuclear sub 核子潛艇
2 an amount of money that you pay regularly to be a member of an organization or club -- 訂閱費,訂購款;服務費;(俱樂部的)會費
3 a long, thin loaf of bread filled with meat or cheese, and often lettuce, tomatoes, etc -- 潛水艇三明治(內夾沙拉、冷切肉或起司的長條形麵包)
a meatball sub 肉丸潛水艇三明治
4 in sports, to play in a match in someone's place -- (體育比賽中)作為替換隊員上場
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。