单词：emittance
emittance的用法和样例：
例句
- Emittance and irradiance are meaningful measurements of flux at a specific surface.发射强度和辐照强度只有对一定表面上通量的量度才是有意义的。
- CSR has little influence on the emittance, the energy spread and the envelope.相干同步辐射引起的发射度增长及能散较小，且不影响束流包络。
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