该条约将战略性核弹头数量 从2002年5月的削减战略性进攻武器条约（SORT）允许的2 200枚削减为1 550枚。

The treaty limits the number of strategic nuclear warheads to 1, 550, reduced from the 2, 200 allowed under the May 2002 Strategic Offensive Reductions Treaty (SORT) agreement.

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同时，该协议将替代去年12月到期的"1991削减战略武器条约"，当时，双发同意将各自战略性核弹头数目限制在1700至2200枚之间。

The new agreement would replace the 1991 Strategic Arms Reduction Treaty, which expired last December. It limited both sides' strategic nuclear warheads to between 1700 and 2200.

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美俄都已经宣布，双方已准备好达成一项新的法律约束条约，以取代双方1991年签署并将于今年12月过期的战略性武器削减的条约(称之为start - 1：第一阶段削减战略武器条约)。

Both America and Russia have declared a readiness to conclude a new legally binding treaty to replace their 1991 strategic arms reduction treaty (called START-1) which expires in December.

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