That treaty recognised five nuclear powers—America, Russia, China, France and Britain.

核不扩散条约承认5个核大国——美国，俄罗斯，中国，法国，英国。

youdao

The concepts of deterrence against state actors are familiar, though not in a world of multiple nuclear powers.

威慑的概念对国家行为者所熟悉，但在世界多个核大国。

youdao

Any agreement would put pressure on Britain, which has 160 nuclear warheads, and other nuclear powers to reduce their stockpiles.

双方达成的任何协议都会对拥有一百六十枚核弹头的英国及其他有核国家造成减少核武备的压力。

youdao

House of Representatives Foreign Affairs Committee chairman Howard Berman voiced hope the new treaty will set an example for other nuclear powers and help strengthen global nonproliferation efforts he says "severely threatened" by Iranian and North Korean efforts to acquire nuclear weapons.

VOA: standard.2010.03.26

The cornerstone of this is the Nuclear Non-Proliferation Treaty, which considers only five countries as nuclear-weapons powers.

VOA: standard.2009.09.29

Iran argues that it has a right to nuclear energy, a point of agreement with Western powers.

VOA: standard.2009.09.28

With Iran facing nuclear powers all around it, the tension is not much less.

NPR: Weak Prospects for Nuclear Nonproliferation Efforts

Only three countries in the world are credible nuclear powers: the United States, Russia and China.

CNN: ASIANOW - Asiaweek | Intelligence | Japan: Self-Destructing

They have fought three wars since independence in 1947 and are now nuclear powers.

BBC: Pakistan film makes India record