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If you look at oxygen, oxygen is 1s2, which is an inner shell electron.
你看，氧是1s2原子，1s轨道上是内层电子。
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- 来自原声例句
If you look at oxygen, oxygen is 1s2, which is an inner shell electron.
你看，氧是1s2原子，1s轨道上是内层电子。
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