We have an orbiting electron but a stationary nucleus.

我们有一个在轨运行的电子和一个静止原子核。

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And so the other thing that we consider is the nucleus as being stationary.

接下来我们讲的是，原子核是静止的。

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And so the other thing that we consider is the nucleus as being stationary.

接下来我们讲的是，原子核是静止的。

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