The Commander of the U.S. Naval Forces in Europe says one thing that concerns him when it comes to Russia is submarine warfare.

正在欧洲的美国海军指挥官说，目前涉及到俄罗斯的一件事是关于潜艇战的。

The Commander of the U.S. Naval Forces in Europe says one thing that concerns him when it comes to Russia is submarine warfare. Why?

美国驻欧洲海军司令官表示，在谈到俄罗斯时，他其中的一个担心是潜艇战。为什么？

However, at the end of January 1917 Germany announced the renewal of unrestricted submarine warfare on the 1st of February.

然而，1917年1月下旬，德国宣布从2月1日起恢复无限制潜艇战。

It is the primary strategic nuclear and conventional weapons platform of the United States Air Force, supporting the US Navy in anti-surface and submarine warfare missions.

它是美国空军的主要战略核武器和常规武器平台，支持美国海军执行反水面和潜艇战任务。

In its aftermath Berlin decided to prioritise submarine warfare and there would be no second major naval clash of this kind again during the First World War.

战后，柏林决定优先考虑潜艇战，第一次世界大战期间不会再发生第二次此类重大海军冲突。

The whole world was discussing the President's remarkable message, when it was dumbfounded to hear, on January 31, that the German ambassador at Washington had announced the official renewal of ruthless submarine warfare.

1 月 31 日，当听到德国驻华盛顿大使宣布正式恢复无情潜艇战时，全世界都在讨论总统的非凡信息。