1N-COUNT 潜艇(亦使用缩略形式sub) A submarine is a type of ship that can travel both above and below the surface of the sea. The abbreviation sub is also used. 潜艇(亦使用缩略形式sub)
...a nuclear submarine.
核潜艇
2ADJ [ADJ n]水下的;海底的Submarine means existing below the surface of the sea. 水下的;海底的 [formal]
...submarine caves.
海底洞穴
...submarine plants.
海底植物
3N-COUNT [usually NOUN n]潜艇三明治,长卷三明治(亦使用缩略形式sub) A submarine sandwich is a long soft bread roll filled with a combination of things such as meat, cheese, eggs, and salad. The abbreviation sub is also used. 潜艇三明治,长卷三明治(亦使用缩略形式sub) [US]