Also the United States and Russia will dispose of more than 700 tons of excess fissile material so that it is no longer usable in nuclear weapons, contributing to the irreversibility of nuclear reductions.
此外，美国和俄罗斯还将处置700多吨超量的裂变材料，使之不再能用于核武器，从而有助于不可逆转地进行核裁减。