振盪
振盪（oscillation）最廣義上係指一個物理量嘅數值隨時間嘅重覆變化，來來回回噉喺 0、+A 同 -A 之間郁嚟郁去，當中 A 係個振盪嘅振幅（amplitude），日常例子包括擺同交流電。
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