您要查找的是不是：
- Sound is caused by vibrations. A vibration is a back and forth movement. 声音是由振动引起的。振动就是往复运动。
- Manual subprogram complets the deflation, and back and forth movement of the radiation samples. 手动子程序完成系统的放气、辐照样品的前进和后退等功能。
- He rocked back and forth in his rocking chair. 他坐在摇椅里前后摇晃着。
- He fluttered back and forth in the corridor. 他在走廊上烦躁不安地走来走去。
- Movement back and forth; reciprocating movement. 往复来来往往的运动；往复运动
- He promenaded back and forth on the ship's deck. 他在船的甲板上来回散步。
- Two small boats ferry people back and forth. 两只小船往返为人摆渡。
- The guard walked back and forth in front of the gate. 警卫在大门前走来走去。
- Nystagmus, irregular rapid movement of the eyes back and forth. 眼球震颤、不规则的快速移动的眼睛来回.
- The shuttle flies back and forth on the loom. 织布机上梭子来回飞动。
- To jerk up and down or back and forth. 上下或前后猛动
- The crowd surged back and forth. 人群前后蜂拥着。
- The tiger's tail lashed back and forth. 老虎的尾巴甩来甩去。
- Back and forth swung the pendulum. 钟摆来来回回地摆动。
- The pendulum swung back and forth. 钟摆来回地摆动。
- The ship is tossed back and forth by the wave. 那船随波涛颠簸。
- The tiger is pacing back and forth in his cage. 老虎在笼子里来回走动。
- We saw the tiger pacing back and forth in the cage. 我们看到虎在笼子里来回走动着。
- Her mind flushed messages to itself back and forth. 这个消息反复地在她的脑子里萦绕。
- Wilson rolled the empty canteen back and forth. 威尔逊翻来倒去摆弄着空水壶。
