Fourth, export controls have failed to prevent the spread of sensitive nuclear technology, not least due to the sophisticated efforts of clandestine networks like the one run by Pakistani nuclear scientist A.Q. Khan. Nine countries already have nuclear weapons, and it would be naive to presume that others, particularly in regions of conflict, will not try to get hold of them.
问题之四在于，出口管制未能阻止敏感核技术的传播。这一点尤其源于秘密核网络所采取的复杂而老练的努力，由巴基斯坦核科学家卡迪尔·汗运作的网络便为其中一例。已经有九个国家拥有核武器，而假定其他国家，尤其是那些身处冲突地区的国家，对于核武器没有非分之想，这真是过于天真了。