How much of their fissile material capabilities are there? Some people say half. Some people say more.

那里的裂变材料生产能力有多少？一些人认为有一半。还有人认为比一半还要多。

In addition, the deal calls on Iran to reduce the enrichment level of its existing nuclear, or fissile, material.

此外，该协议要求伊朗降低其现有核材料或裂变材料的浓缩水平。

And she says to make the bomb, the Manhattan Project scientists needed to use something called fissile material.

她说，为了制造炸弹， 曼哈顿计划的科学家需要使用一种叫做裂变材料的东西。