A previously unknown extremist group has said it carried out Friday's bomb attack.

一个先前未知的极端分子组织声称其实施了周五的炸弹袭击。

《柯林斯英汉双解大词典》

The bomb is for self-protection and it also has a deterrent effect.

炸弹是用来自卫的，而且它还有威慑作用。

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If the computer picks up on a possible situation - say, a passenger has a dirty bomb or a bioweapon - a series of actions will occur.

如果计算机捕捉到可能发生的情况，比如一名乘客携带脏弹或生物武器，一系列动作将随之启动。

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Iraq constructed centrifuges (which spin uranium to extract the U-235 used in a bomb) before the Gulf War so has the knowledge to do this again.

BBC: Iraq dossier - what to look for