yard·stick /ˈjɑrdˌstɪk/
  碼尺,準繩
  Yard·stick n. A stick three feet, or a yard, in length, used as a measure of distance, cloth, etc.
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  yardstick
       n 1: a measure or standard used for comparison; "on what kind of
            yardstick is he basing his judgment?"
       2: a ruler or tape that is three feet long [syn: yard measure]