调用集体防御，北约加入了阿富汗之战。
Invoking collective defence, NATO joined the war in Afghanistan.
面对共同的实际情况需要采取集体防御的行动。
Recognize Shared realities and the need for collective defences.
集体防御总是假定美国将会给欧洲支援，来对抗一个超级大国，像苏联。
Collective defense always assumed that America would come to Europe's aid against a superpower like the Soviet Union.
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