往复

往復
wǎng
  1. to go and come back
  2. to make a return trip
  3. backwards and forwards (e.g. of piston or pump action)
  4. to reciprocate (of machine part)

CEDICT

  1. again and again; repeatedly; time and time again
  2. to contact; to get in touch with
  3. to go and come back; to make a round trip; to go forwards and backwards

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