1N-UNCOUNT 精通;掌握 If you show mastery of a particular skill or language, you show that you have learned or understood it completely and have no difficulty using it. 精通;掌握
He doesn't have mastery of the basic rules of grammar. [+ of]
他还没有完全掌握基本的语法规则。
He demonstrated his mastery of political manoeuvring.