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.
例句
...a nuclear submarine.核潛艇
ADJ
水下的;海底的
Submarine means existing below the surface of the sea.
例句
...submarine caves.海底洞穴...submarine plants.海底植物
N-COUNT
潛艇三明治，長卷三明治(亦使用縮略形式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.