例句與造句

1. Rays are emitted from the nuclei of unstable atoms during radioactive decay , while x - rays are from the electron cloud as the result of electron excitation
   射線是由不穩(wěn)定原子核射出的，而射線則由受激發(fā)的電子云射出。
2. Rays are emitted from the nuclei of unstable atoms during radioactive decay , while x - rays are from the electron cloud as the result of electron excitation
   射線是由不穩(wěn)定原子核射出的，而射線則由受激發(fā)的電子云射出。
3. It's difficult to find electron excitation in a sentence. 用electron excitation造句挺難的