美国人有谚语: 如果你走路像鸭子，如果听起来像鸭子，那可能是一只鸭子。!

说的意思是，如果你看到的东西，看起来像鸭子可能不是鹅或鲸鱼或斑马和你的想法，即鸭子. Of course, there is no guarantee that it must be a duck, for example, someone may have made a mechanical duck to deceive you, or you may not understand the signs of being a duck well and the fault may be due to your senses, but the predominant suspicion is the duck.