First, be good at [shàn yú]
Longer than; Be good at (sth): ~ unite the masses.
Second, professional knowledge.
[zhu ā n chá ng] 〃 < name > professional knowledge and skills; Major.
[zhā n zh m: ng] 〃 Very long.
Third, be good at [shàn cháng]
What he is good at: his calligraphy.
Fourth, major.
1, good at (a skill): ~ play well. ~ program. He is very good at painting landscape paintings.
2. Confidence in success; Grasp: Yes. No ~
Fifth, longer than [Changyu]
Do (sth) exceptionally well; Good at: He ~ Music.