您要查找的是不是：
- They are building a submarine cable tunnel. 他们正在建设一条海底电缆隧道。
- This destroyer can overrun any submarine. 这艘驱逐舰的速度比任何潜水艇都快。
- The vessel was ruined by a submarine. 那艘船是被潜水艇毁坏的。
- The ship was sunk by an atomic submarine. 这艘船是被一艘核潜艇击沉的。
- Everything is quiet on the frontier. 边境上一切安静。
- The car was turned back at the frontier. 汽车在边境处被拦住了。
- The submarine rose to the surface. 潜艇露出了水面。
- The ship was stopped by a surfaced submarine. 那艘船被一浮出水面的潜水艇拦住了。
- Our frontier guards held up under fierce enemy attack. 我们的边防战士在敌人猛烈进攻下巍然不动。
- Submarine cables were laid across the Atlantic. 铺设了横越大西洋的海底电缆。
- Can you git a fix on the submarine? 你能确定那潜艇的位置吗？
- The submarine submerged to avoid enemy ships. 该潜艇潜入水下以躲避敌舰。
- The frigate rammed the submarine. 护卫舰撞击了潜艇。
- The frontier ranges from the northern hills to the southern coast. 边界从北部山地一直延伸到南部海岸。
- The frontier range from the northern hill to the southern coast. 边界从北部山地一直延伸到南部海岸。
- A telegram sent by submarine cable. 海底电报通过海底电缆拍发的电报
- By pooling our talents and resources we can make space a new frontier of peace. 如果我们把才能和资源汇合起来，就能把太空这个尚未开拓的疆域变成一个新的和平疆域。
- The soldiers garrison the frontier. 战士们驻守边陲。
- At the first sign of danger the submarine will submerge. 一有危险迹象，潜艇就会潜入水中。
- The pressure inside the old submarine was almost unendurable. 老式潜艇内的压力几乎是难以忍受的。
