subKK [ˈsʌb] ｜ /ˈsʌb/
GEPT 中高級
C2noun
a type of underwater warship often equipped with torpedoes
The Navy used a sub to track and destroy the enemy’s ships.
潛艇；潛水艦
C2noun
a large sandwich made of a long roll filled with meats, cheese, vegetables, condiments, and sometimes dressing; also known by different names in various regions of the United States
I ordered a turkey and cheese sub with lettuce, tomato and mayo for lunch.
C1verb
to act as a replacement or substitute
I need to sub in for my coworker who is sick today.
代替；替補