mastery
n. 精通，熟练掌握；控制，驾驭
复数 masteries
例句
She has mastery of several languages.
她精通数门语言。
《牛津词典》
He doesn't have mastery of the basic rules of grammar.
他没有掌握基本的语法规则。
《柯林斯英汉双解大词典》
Later, I developed a broader theory of what separates the two general classes of learners helpless versus mastery oriented.
后来，我发展了一个更广泛的理论来区分无助型学习者和掌握型学习者。
