af·ter·ef·fect /ˈæftərəˌfɛkt/
  餘波,後效,後果
  af·ter·ef·fect /ˈæftərɪˌfɛkt/ 名詞
  後效,後作用
  aftereffect
       n 1: any result that follows its cause after an interval
       2: a delayed effect of a drug or therapy; "the drug had
          unexpected aftereffects"