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All the energies are negative because it is a bound system. I start up here with n equals one.
所有能量级都是负数，因为它是一个束缚系统,在这里我从n等于1讲起。
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It is a conservative system so all the energies are negative.
它是一个保守系统,所以所有的能量级都是负值。
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