vacant energy level造句

"vacant energy level"是什么意思   


  1. The electron ( green 1 . ) can tunnel onto the island ( 2 . ), occupying a previously vacant energy level.
  2. After the electron has been ejected, the atom is left with a vacant energy level, also known as a L shell to the K shell, the X-ray emitted is called a K-alpha X-ray.
  3. It's difficult to find vacant energy level in a sentence. 用vacant energy level造句挺难的


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