fission material 裂变物质
The nuclear reaction can be controlled utilizing rods made of neutron-absorbing material, such as boron, essentially shutting down the fission process.
核反应可以通过使用由吸附中子的材料构成的棒条，比如硼，来减慢裂变过程，从而控制其反应。
So if you take a certain volume and you have a certain amount of material, let's just take the fission cross section as the issue.
所以，如果你得到一定的容积,你有一定量的材料，我们就把裂变横截面当做问题。
When planets are close to the black hole, their material structures are torn up creating a strange centripetal nuclear fission.
星体在接近黑洞时，星体的物质结构被撕裂，这是奇怪的向心核裂变。
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