mastery

She demonstrated her complete mastery of the violin by performing the complex concerto without any mistakes.

(Chinese) 她通过毫无差错地演奏那首复杂的协奏曲，展现了她对小提琴的完全精通。

Mastery of basic mathematics is essential before moving on to advanced calculus.

(Chinese) 在开始学习高等微积分之前，熟练掌握基础数学是必不可少的。