The pit vipers are a large group of advanced venomous snakes that evolutionarily arose in china but spread to the new world across an ancient land bridge connecting northeastern siberia with alaska.
蝮亚科（pitvipers）起源于中国，是通过连接西伯利亚东北部与阿拉斯加的古陆桥而扩散到美洲的一大类高等的毒蛇。
The pit vipers are a large group of advanced venomous snakes that evolutionarily arose in china but spread to the new world across an ancient land bridge connecting northeastern siberia with alaska.
蝮亚科（pitvipers）起源于中国，是通过连接西伯利亚东北部与阿拉斯加的古陆桥而扩散到美洲的一大类高等的毒蛇。
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