proficiency

n. /prəˈfɪʃ.ən.si/ C1

熟练；精通

The ability to do something well; great skill.

仙境例句

The old crab taught Laughing and Grief with such proficiency that no fish did either better.

老螃蟹教“笑”和“悲伤”教得十分拿手，没有哪条鱼比他笑得更好、哭得更好。