By then, China may have 70 attack submarines.
而到那时，中国可能已经拥有了70艘攻击型潜艇。
Press reports say three submarines may follow.
新闻报导指出，三艘潜艇可能亦会列入订单。
It's a secret mission, they are after submarines.
是秘密任务，他们在追踪潜水艇。
Similar problems also were found on at least three other Virginia-class submarines.
类似的问题至少在另外3艘弗吉尼亚级潜艇上也被发现过。
The accident probably happened because the two submarines were not aware of each other.
事故很可能是由于两艘潜艇都未发现对方。
Modern submarines are very, very quiet.
现代潜艇的航行是悄然无声的。
Always on guard against shadowing submarines.
时刻警惕跟踪的潜艇。
The lake has 4 working submarines that people can ride.
湖中有四个潜水艇可供人们乘坐。
It is of vital importance in acoustic stealth design for submarines.
声辐射的控制对于舰艇的声隐性有着重要意义。
Underwater mechanical noise is one of the main noise sources of submarines.
机械噪声是水下航行器主要噪声源之一。
Recently, construction and acquisition of new submarines has begun to intensify.
最近一段时间，新型潜艇的建造和采购开始密集起来。
Submarines can submerge very quickly.
潜水艇能快速地潜入水中。
Submarines are already being powered by atomic energy.
潜水艇现在已经由原子能来驱动了。
Submarines are already being powered by atomic energy.
潜水艇现在已经由原子能来驱动了。
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