Since entering into force in 1968, the NPT has been central to holding the line on the spread of nuclear weapons. Nowadays, apart from the original nuclear powers – the US, the UK, France, and Russia – the only other countries with these weapons are China, Israel, India, Pakistan, and North Korea.
自1968年生效以来，核不扩散条约一直是勒紧核武器传播限制的关键。如今，除了最初的四个有核国家——美国、英国、法国和俄罗斯外，只有中国、以色列、印度、巴基斯坦和朝鲜拥有核武器。