previous to
  在…之前
  Pre·vi·ous a.  Going before in time; being or happening before something else; antecedent; prior; as, previous arrangements; a previous illness.
  The dull sound . . . previous to the storm,
  Rolls o'er the muttering earth.   --Thomson.
  Previous question. Parliamentary Practice See under Question, and compare Closure.
  Previous to, before; -- often used adverbially for previously. “Previous to publication.” --M. Arnold.  “A policy . . . his friends had advised previous to 1710.” --J. H. Newman.
  Syn: -- Antecedent; preceding; anterior; prior; foregoing; former.
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