tread·mill /ˈtrɛdˌmɪl/
 踏車,單調的工作
 tread·mill /ˈtrɛdˌmɪl/ 名詞
 跑台,活動地板,踏車
 Tread·mill n. A mill worked by persons treading upon steps on the periphery of a wide wheel having a horizontal axis. It is used principally as a means of prison discipline. Also, a mill worked by horses, dogs, etc., treading an endless belt.
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 treadmill
      n 1: an exercise device consisting of an endless belt on which a
           person can walk or jog without changing place
      2: a mill that is powered by men or animals walking on a
         circular belt or climbing steps [syn: treadwheel, tread-wheel]
      3: a job involving drudgery and confinement [syn: salt mine]