But there was a big problem with negotiating a comprehensive test ban which is how do you know that the other side will hold up their end of the bargain?

但全面禁试谈判有一个大问题，那就是如何知道对方会履行诺言？

A number of world leaders called for a comprehensive test ban, no more testing of nuclear weapons by any state and this call was actually taken seriously by the world's nuclear powers.

多位世界领导人呼吁全面禁止核试验，任何国家不再进行核武器试验，这一呼吁实际上得到了世界核大国的重视。