One gets a contribution from an electron outside closed shells and also a possible contribution coming from an incomplete shell or a hole in a closed shell.

化学键的形成来源于一个满壳层之外的电子，也有可能是形成于一个不完全的壳层或满壳层上的一个电子空穴。

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"The deleveraging process is incomplete, the recovery remains fragile and a considerable margin of spare capacity is yet to be worked off, " Bean said at a conference in Jackson Hole, Wyoming.

一降低杠杆风险的行为过程是残缺的、回收仍然脆弱和相当的闲置产能还需进一步的研究，“小豆说，在怀俄明州杰克逊霍尔。

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