conventional submarine

例句：

1. 1. The conventional submarine is a popular choice for military and commercial use.
   常规潜艇是军事和商业用途的热门选择。
2. 2.The submarine was designed to withstand extreme pressure and temperatures.
   这艘潜艇被设计来承受极端的压力和温度。
3. 3.The submarine's advanced technology has made it one of the most efficient ships in its class.
   这艘潜艇的先进技术使它成为同类中最高效的船只之一。