The karen had been sailing in a convoy to russia when she was torpedoed by an enemy submarine . 卡伦号是护送船只到俄国去的，途中遇到敌人潜水艇的鱼雷袭击。
On arrival we will circle for twenty minutes at low altitudes, looking for a u-boat. after twenty minutes we return to base . 一到目的地就低空飞行，寻找潜水艇。二十分钟后返回基地。
One, an old barque, had been big enough for a sub to bother with and the sub had shelled her . 一条是陈旧的敞篷汽艇，比较大。潜水艇要搞掉它还真得费点儿力气，而它也确实挨了潜艇的炮弹。
There had been a blazing row while the u-boat was in dock between heer's superior officer and wohl's . 在潜水艇还未潜入水底，停靠在船坞里的时候，黑尔和沃尔各自的上司之间发生过一次激烈的争吵。
If you were sending a u-boat in to pick up a fugitive spy, what would you think was the nearest sub could safely come to the coast ? 如果让你派潜水艇接应一个逃亡间谍，你认为哪是最近最安全的接应点？
The u-boat should be so effectively countered that our convoys could count with comparative certainty on making a safe atlantic crossing . 对敌潜水艇应采取有效措施，以使我横渡大西洋的护航队获得相当安全。
The ship was stopped by a surfaced submarine 那艘船被一浮出水面的潜水艇拦住了。
Why can a submarine float and sink 为什么潜水艇既能浮在水面，又能潜入水底？
This destroyer can overrun any submarine 这艘驱逐舰的速度比任何潜水艇都快。
And we live beneath the waves in our yellow submarine 在黄色潜水艇里我们乘风破浪。
