往复运动 wǎng fù yùn dòng

DEFINITIONS

  1. backwards and forwards action (e.g. of piston or pump)
  2. reciprocating motion

CHARACTERS

往 wǎng
HSK 2
go, depart; past, formerly
复 fù
HSK 3
return; repeat; repeatedly
运 yùn
HSK 2
run; simplified form of 運 luck, fortune; ship, transport
动 dòng
HSK 2
move, happen; movement, action