- up-and-down movement
- 垂直: perpendicular; vertical; squ ...
- 往复运动: advance and return movement; ...
- 垂直方向往复运动: up-and-down motion
- 使往复运动: reciprocate
- 往复运动: advance and return movement; alternate method; alternate motion; alternating motion; alternative motion; back and forth motion; back and forth movement; motion; reciprocating; pulsating motor; reciprocal action; reciprocal motion; reciprocate; reciprocating motion; reciprocating movement; reciprocation motion; seesaw motion; shuttle; to and fro motion; to-and-fro movement
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