oscillatory
  (a.)振動的,動搖的,變動的
  os·cil·la·to·ry /ˈɑsələˌtorɪ, ˌtɔr-/ 形容詞
  振盪的,振動的
  Os·cil·la·to·ry a.  Moving, or characterized by motion, backward and forward like a pendulum; swinging; oscillating; vibratory; as, oscillatory motion.
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  oscillatory
       adj : having periodic vibrations [syn: oscillating]