掌握的很好用英语怎么说

"Master" is a verb meaning to have a good understanding and control of a particular skill or subject.

For example:

She has mastered the art of cooking French cuisine.
(她已经掌握了法国菜烹饪的艺术。)
He has mastered playing the piano.
(他已经掌握了弹钢琴的技巧。)

The verb "to master" comes from the Old English "mǣstrian," meaning "to control, govern, be master of." It has been in use in English since at least the 14th century.