oscillating

动词 oscillate:

1. be undecided about something; waver between conflicting positions or courses of action
   同义词：hover, vibrate, vacillate, oscillate
2. move or swing from side to side regularly
   同义词：oscillate, vibrate

形容词 oscillating:

1. having periodic vibrations
   同义词：oscillatory

1. A movement from and back to a mean position or axis in an oscillating or alternating motion.
   移动从中间位置或轴线向外或向后的振荡或依次的运动