他既精于数学又精于文学。

He is already skilled in both math and literature.

Source: Tatoeba

Sentence Composition

1 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
2 既 jì
  1. already
  2. since
  3. both... (and...)
3 精于 jīngyú
  1. skillful in
  2. proficient in
  3. adept at
4 数学 shùxué mathematics
5 又 yòu
  1. (once) again
  2. also
  3. both... and...
  4. and yet
  5. (used for emphasis) anyway
6 精于 jīngyú
  1. skillful in
  2. proficient in
  3. adept at
7 文学 wénxué literature