预先

預先
yùxiān
beforehand; in advance

CEDICT

Entry Composition

1 预 yù
  1. to advance
  2. in advance
  3. beforehand
  4. to prepare
2 先 xiān
  1. beforehand; first; earlier
  2. at first; originally
  3. for the time being; for now
  4. (prefix) my late (in referring to deceased relatives older than oneself)