潜艇在海上是不会受到攻击的。

The submarine is invulnerable to attack while at sea.

《牛津词典》

而到那时，中国可能已经拥有了70艘攻击型潜艇。

By then, China may have 70 attack submarines.

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电被用来照明、取暖以及获得能量，并用来保护潜艇以免受到攻击。

Electricity is used for light, heating, power and to defend the ship against attacks.

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潜艇隐蔽攻击是一个非常复杂的动态系统。

Submarine's stealthy attack is a complicated dynamic system.

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潜艇隐蔽攻击是一个非常复杂的动态系统。

Submarine's stealthy attack is a complicated dynamic system.

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