首先，这些武器应当只在遭受核袭击后反击时才使用。其次，这些武器的拥有必须是一种临时的应急手段。

First, the weapons should be intended for use only in retaliation after a nuclear attack. Second, the possession of the weapons must be a temporary expedient.

《柯林斯英汉双解大词典》

他并没有指明是核袭击，但并不排除这个可能性。

He did not specify nuclear attacks, but did not exclude them.

youdao

一旦发生核袭击，其他未受辐射地区的银行可以迅速备份并继续运行。

In the event of a nuclear attack, we'd be back up and running in all non-irradiated areas very quickly.

youdao