So, that's his gift to us: the Lewis structure, and the idea that you could share electrons and form a covalent bond.
这就Lewis给我们的礼物，Lewis结构，你能够通过公用电子，形成共价键。
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The electrovalent bond weakens and the covalent bond strengthen between manganese and oxygen due to ion polarization effect, which makes the spinel structure more stable.
In the second part, a readily modifiable structure with C3 symmetry was developed to quantitatively build a series of 3D shape-persistent fluorescent nanocages via dynamic covalent chemistry.