When I read Catechism, the term “grace” is quite confusing. There are at least four types of grace I read: sanctifying grace, habitual grace, actual grace, and special grace. So, recently, I tried to solve my confusion by going through these differences. By reading the Catechism again and again (the related part only), and also some other resources, so, I simplify them,
Sanctifying (or deifying) grace = 圣化恩宠, permanent state of grace.
Habitual grace = 常居的恩宠（宠爱）, is also sanctifying grace.
Actual grace = 现时的恩宠（宠佑）, transient help to act (intervention of God), different from habitual grace. Also called “gratuitous grace” in Summa Theologica.
Special grace = 特别的恩宠（神恩）, also charism, oriented to sanctifying grace. Considered actual grace.
So, conclusion, grace is actually divided into two: sanctifying grace and actual grace.
But I also found something about sacramental grace. Sacramental grace is the grace received when receiving sacraments. So, the grace can be sanctifying grace for permanent or actual grace.