C 代用品，代替者，替补队员 substitute,especially in football or cricket
P (上交俱乐部的)会员费 subscription to a club,etc.
句型例句
Our aircraft sank the sub by dropping depth bombs.我们的飞机用深水炸弹炸沉了潜艇。
England brought on a sub in the second half.英国队下半场换上了一名替补队员。
Have you paid your tennis-club sub yet?你付了网球俱乐部的会员费了吗？
