in sports, a player who is used for part of a game instead of another（体育比赛中的）替补队员

US a teacher who replaces teachers who are absent from work代课教师

a ship that can travel under water潜艇

UK an amount of money that you pay regularly to be a member of an organization or club订阅费，订购款；服务费；（俱乐部的）会费

US a long, thin loaf of bread filled with meat or cheese, and often lettuce, tomatoes, etc潜艇三明治（内夹色拉、冷切肉或奶酪的长条形面包）

[ I ] in sports, to play in a match in someone's place（体育比赛中）作为替换队员上场

[ I ] US to do a job temporarily when someone else cannot do it临时代替他人做…

[ T ] UK to replace one player with another during a game（体育比赛中）替换…上场

less than a number or level少于；低于

below or in a lower position在…位置之下；在…下方的位置

almost or nearly几乎，近乎，差不多

being a smaller part of a larger whole次；分支

not as good as不如…那么好的

less important or lower in rank次要的；下级的；从属的