ace·tyl·cho·line /əˌsɛtḷˈkoˌlin, ˌsi; ˈæsəˌtil-/
  醋膽素
  ace·tyl·cho·line /əˌsɛtḷˈkoˌlɪn, ˌsɪt; ˌæsəˌtɪl-/ 名詞
  acetylcholine
       n : a neurotransmitter that is a derivative of choline; released
           at the ends of nerve fibers in the somatic and
           parasympathetic nervous systems