定域键是只存在于两个原子之间的共价键，属分子学学科。
线形结构大多形成强弱交替的定域键。
Linear structure forms localized bond in strong-weak cycles.
现在我们来考察一个用经典的定域键结构怎样也不能正确表示的体系。
Let us now look at a system that in no way can be adequately represented by a single classical localized bond structure.
利用群论的方法及定域键的观点可以把轨道对称守恒原理表述为键对称守恒规律。
The conservation principle of orbital symmetry may be represented as conservation law of bond symmetry, by means of group theory and the point of view of the localized bonds.
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