mastery
noun [ U ] uk/ˈmɑː.stər.i/ us/ˈmæs.tɚ.i/
(CONTROL)
完全的控制
complete control of something
her mastery of the situation 她对局势的牢牢掌控
(SKILL)
熟练，精通
If someone has a mastery of something, they are extremely skilled at it.
her mastery of the violin 她娴熟的小提琴演奏技法