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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初始调查显示该攻击型潜艇事故包括一处空气净化系统，其首部受到轻微损害。

Initial investigations indicated that the accident aboard the hunter-killer submarine involved a piece of air purification equipment in its forward section. It caused only superficial damage.

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最初，第一艘攻击型潜艇上装载有一个木制手动升降柄和皮革爆炸管，爆炸管用来把炸药用木钉固定在舰船上。

In the beginning, the first attack subs consisted of a man hand-cranking away in a wood and leather suicide tube while attempting to attach explosives to a battleship using a wooden screw.

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