Mr. president, what do we do if a german u-boat does attack? i agree it's unlikely. but suppose it happens ? 总统先生，要是德国潜艇发动进攻，咱们怎么办？我同意这不大可能，可是万一发生了呢？
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？
On two or three occasions, notably on october l7, 1914, the alarm was given that there was a u-boat inside the anchorage . 曾有两三次，尤其是在1914年10月17日，警报传出，说在停泊所内发砚了一艘潜艇。
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 elimination of the three german "aces" in march and the improvement in our defence measures had their effect on u-boat tactics . 三月间，我们消灭了德国的海上“王牌”，我们的防御措施也有所改进，这些对潜艇战术发生了影响。
The only incidents which occurred to mar the precision of this remarkable concentration were the loss by u-boat attack of three ships in convoy . 这次罕见的船队大集中，体现了高度的准确性，唯一美中不足的是，船队有三艘船只被潜艇击沉。
In june 1943 the beaten remnants of the u-boat fleet ceased to attack our north atlantic convoys, and we gained a welcome respite . 1943年6月，被打垮的残存的德国潜艇舰队，不再袭击我们北大西洋的商船队了，因此我们获得了一个值得欢迎的喘息机会。
