单词	rubber boa
释义	rubber boa noun variants or rubber snake : a harmless blunt-tailed snake (Charina bottae) of the family Boidae that is rubbery in smoothness and suppleness of appearance, usually less than 18 inches long, and found in the moister regions of western North America called also ball snake, two-headed snake Word History First Known Use 1897, in the meaning defined above
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