two-level medium造句

例句与造句

1. Far from resonance , the two - level medium becomes transparent but the index of refraction is almost the same as in a vacuum
   在远离共振区，吸收很小，但此时折射率也变得和真空中一样。
2. It's difficult to find two-level medium in a sentence. 用two-level medium造句挺难的