mastery

🇬🇧/ˈmɑːstəri/ 🇺🇸/ˈmæstəri/📚 7733 14 1六级
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. 掌握

noun [抽象名词]精通,熟练掌握;控制,驾驭

He doesn't have mastery of the basic rules of grammar.
他没有掌握基本的语法规则。

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