spontaneous fission rate

例句：

1. 1. The spontaneous fissionrate of this material is very high.
   这种材料的自发分裂速率非常高。
2. 2. Thestudy of spontaneous fission rates is crucial for understandingthe behavior of matter.
   研究自发分裂速率对于理解物质的行为至关重要。
3. 3. The researchersfound that the spontaneous fission rateswere consistent with expectations.
   研究人员发现自发分裂速率与预期一致。