名词

1. 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.

2. 统治;控制
Mastery is power or control over something.

1. the act of mastering or subordinating someone

Synonym: subordination

2. great skillfulness and knowledge of some subject or activity

e.g. a good command of French

Synonym: commandcontrol

3. power to dominate or defeat

e.g. mastery of the seas

Synonym: dominationsupremacy