"On this day,we gather because we have chosen hope over fear,unity of purpose over conflict and discord,"
VOA: standard.2009.12.29
n l m s Once we have chosen a certain mix of n, l, m and s, it is used once for that particular atom.
一旦我们选定了一组量子数,它就只能被一个固定原子所有。
We have a weight on the piston, and that weight is chosen so that p2 it acts as though p external is equal to p2.
让活塞上放一重物,让它的效果刚好,等同于外压强。
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