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.

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。

《柯林斯英汉双解大词典》

Such a war could result in the use of chemical and biological weapons.

这样一场战争可能导致生化武器的使用。

《柯林斯英汉双解大词典》

So did their inability to use heavy weapons in counter-attacks.

不能在反击中使用重武器也起到推波助澜的作用。

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Several lawmen in the Old West had learned to use their weapons when they were criminals.

VOA: special.2010.03.10

North Korea,as it has in the past, has reacted to the joint exercise with strong threats -- saying they may lead to a "sacred war" in which Pyongyang would be compelled to use its nuclear weapons.

VOA: standard.2010.07.26

The onus is really on the government of the United States to reveal more about the ways in which it makes sure that arbitrary executions, extrajudicial executions are not, in fact,being carried out through the use of these weapons,".

VOA: standard.2009.10.27

The State Department has very strict rules on who can bring weapons in and use them, and they are overseen by the State Department.

NPR: Oversight of Blackwater a 'Grey Zone,' Author Says

In effect, more nuclear weapons states today threaten to use nuclear weapons in non-nuclear conflicts than was the case during the Cold War.

NPR: Nuclear Weapons Gain Importance for Regional Powers

"There have been fears for months in the region, and the world, over the danger of chemical weapons use in Syria, " Jordan's information minister Samih al-Maitah said in an interview.

WSJ: Syria Chemical Report Spurs Probes, Theories