德国也开始为潜艇战提供各项新型技术。
Germany too marshaled its technological genius to support the submarine campaign.
在潜艇战中，空军的致敌于死命的威力还没有发挥出来。
The lethal power of the air in u-boat warfare was yet to come .
德国是在消耗战中第一个有效地利用潜艇的国家。
Germany was the first nation to effectively use the submarine in an attrition war.
德国是在消耗战中第一个有效地利用潜艇的国家。
Germany was the first nation to effectively use the submarine in an attrition war.
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