sub
noun [ C ] informal uk/sʌb/ us/sʌb/
(REPLACEMENT)
（体育比赛中的）替补队员
in sports, a player who is used for part of a game instead of another
One of the players was injured during the match, so a sub was brought on. 比赛中一个队员受了伤，于是一个替补队员顶上了。
Synonym: substitute
US代课教师
a teacher who replaces teachers who are absent from work
A trained teacher, he found work as a sub which fit around his other commitments. 他是一名受过培训的教师，他觉得做代课老师这样的工作便于他做其他事情。
Synonym: substitute teacher
(SHIP)
潜艇
a ship that can travel under water
a nuclear sub 核潜艇
Synonym: submarine
(MONEY)
UK订阅费，订购款；服务费；（俱乐部的）会费
an amount of money that you pay regularly to be a member of an organization or club
Have you paid your tennis club sub yet? 你付过网球俱乐部的会费了吗？
Synonym: subscription
(SANDWICH)
US潜艇三明治（内夹色拉、冷切肉或奶酪的长条形面包）
a long, thin loaf of bread filled with meat or cheese, and often lettuce, tomatoes, etc
a meatball sub 肉丸潜艇三明治
Synonym: submarine sandwich
sub
verb informal uk/sʌb/ us/sʌb/ -bb-
[ I ]（体育比赛中）作为替换队员上场
in sports, to play in a match in someone's place
Travis subbed for the injured defender. 特拉维斯替换受伤的后卫上场。
[ I ] US临时代替他人做…
to do a job temporarily when someone else cannot do it
As a young player, he subbed for Duke Ellington's drummer. 年轻时，他曾做过艾灵顿公爵的替补鼓手。
I subbed as a teacher for a semester. 我当过一个学期的代课老师。
[ T ] UK（体育比赛中）替换…上场
to replace one player with another during a game
He was subbed in the match against Newcastle. 他在对纽卡斯联队的比赛中被替换下场了。