The weapons are of little military use, but they are still the symbolic link that couples America's nuclear Arsenal to the defence of Europe.

这些武器的军事作用虽微乎其微，但它们却仍是一条象征性的纽带，将美国的核武库与欧洲的防御联系在一起。

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Air Force One has a gym, electronic defence units and shielding to protect it from nuclear blasts.

空军一号配有一间健身房，电子防御装置和能使其免受核爆炸破坏的外壳。

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Nuclear reactors are protected by what plant designers call "defence in depth".

设计者声称核反应堆在“纵深防御”[2]下会得到保护。

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The researchers also say that the successor to the Trident nuclear defence system should be scrapped.

BBC: Scientists call for defence cuts

Former Liberal Democrat leader Sir Menzies Campbell called for the Trident nuclear defence system to be included in the strategic defence review, saying it was "illogical" to exclude it.

BBC: Queen's Speech: Hague reveals size of Trident stockpile

It has agreed to host the radar component of a proposed NATO nuclear missile defence shield, a project that is aimed mainly at Iran, with which Turkey has a tricky relationship.

ECONOMIST: Israel and Turkey