至於

至于
zhìyú
  1. as for
  2. as to
  3. to go so far as to

CEDICT

Entry Composition

1 至 zhì
  1. to arrive
  2. most
  3. to
  4. until
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