back and forth

副词 back and forth:

1. moving from one place to another and back again
   同义词：backward and forward, to and fro

1. A jump in ballet during which the dancer crosses the legs a number of times, alternately back and forth.
   空中交叉跳跃一种芭蕾舞动作，舞者在空中多次前后交叉双腿
2. He fluttered back and forth in the corridor.
   他在走廊上烦躁不安地走来走去。
3. The guard walked back and forth in front of the gate.
   警卫在大门前走来走去。
4. He rocked back and forth in his rocking chair.
   他坐在摇椅里前后摇晃着。