長於

长于
chángyú
  1. to be adept in
  2. to excel at

CEDICT

  1. (formal) to be good at something; to be expert in; to be skilled in
  2. to be good at something; to be expert in; to be skilled in

Wiktionary

善於

維基詞典

Entry Composition

1 長 cháng
  1. long
  2. (bound form) length
  3. (bound form) strong point; forte
  4. (bound form) to be good at
  5. (literary) surplus; spare (Taiwan pr. zhàng)
2 於 yú
  1. (of time or place) in; at; on
  2. (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for
  3. (indicating a source) from; out of
  4. (used in comparison) than
  5. (used in the passive voice) by

Related entries

見長 jiàncháng to excel at (typically used after the area of expertise) (Example: 以研究見長 yǐyánjiūjiàncháng to be known for one's research)