involving two atoms sharing one or more pairs of electrons that hold them together

The covalent binding of drugs to receptors results in stable long-lasting complexes. 药物与受体的共价结合会形成稳定持久的复合物。

In covalent solids, such as carbon and silicon, covalent bonds form between neighbouring atoms by electron sharing. 在碳和硅等共价固体中，相邻原子之间通过电子共享形成共价键。

This provides evidence that the bonding in aluminium oxide is not purely ionic nor is it purely covalent.