1. The concept of electrovalence is important in understanding chemical reactions involving ionic compounds.
电化价的概念在理解涉及离子化合物的化学反应中起着重要作用。

2. The electrovalence of an atom is determined by the number of electrons it gains or loses when forming a chemical bond.
当形成化学键时，原子的电化价由它得失的电子数决定。