sub

• 名词，指用长条形脆面包夹肉、奶酪等食材制成的大三明治，或指通常装备鱼雷的潜艇。

A noun referring to a large sandwich made from a long crusty roll filled with meats, cheese, and other ingredients, or a submersible warship typically armed with torpedoes.

1. A2informalamericanculinary

   A large sandwich made from a long crusty roll split lengthwise and filled with meats, cheese, and various toppings like lettuce, tomato, and onion.

   潜艇三明治

   • I ordered a turkey sub with extra cheese for lunch.
   • The deli makes the best Italian sub in town.
   • She ate half a sub and saved the rest for later.

   同义词grinderherohoagieitalian sandwichtorpedowedgezeppelin

2. SubmarineB1formal

   A submersible warship, typically armed with torpedoes, used for naval operations.

   潜艇

   • The navy deployed a nuclear-powered sub on a reconnaissance mission.
   • The crew of the sub spent months underwater.
   • Sonar detected an enemy sub approaching the fleet.

   同义词submarinesubmersibleu-boat

• 动词，表示替换某人或某物，或代替某人行事、作为替补上场。

A verb used to indicate the act of substituting for someone or something, or to act as a replacement.

1. B2informal

   To act as a substitute for someone or something, especially in a sports team or work role.

   替补

   • He subbed for the injured player in the second half.
   • I subbed in for my colleague during the meeting.
   • She subbed as the lead singer for the band's tour.

   同义词cover fordeputizefill inrelievereplacespellstand insubstituteunderstudy

   反义词continueremainstay