The secondary valence is directed toward fixed positions in space .

副介指向空间的确定位置。

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Every element tends to satisfy both its primary and secondary valence.

每一元素倾向于既满足它的主价又要满足它的副价。

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Every element tends to satisfy both its primary and secondary valence.

每一元素倾向于既满足它的主价又要满足它的副价。

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