这型潜艇建造目的是针对英吉利海峡以及港口布雷。

Evidently this one was employed to mine the English Channel and harbor approaches.

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港口和海峡也会用于夜晚和雾天的导航。

They were also used in harbor channels for navigation at night and in fog.

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港口和海峡也会用于夜晚和雾天的导航。

They were also used in harbor channels for navigation at night and in fog.

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