Kids these days are really multitalented. Violin players, ballet dancers and whatnot. Heck, they're even fluent in Cantonese, Putonghua, and English. It's insane.
Cantonese
精通军事
精通軍事
zing1 tung1 gwan1 si6
to be proficient in military affairs
Cantonese
精通
精通
zing1 tung1
to be proficient in; to master; to have a good command of