water moccasin

water-moccasin的词性：
n.（名词）

1. A semiaquatic pit viper (Agkistrodon piscivorus) of lowlands and swampy regions of the southern United States. Also called cottonmouth
水蝮蛇：美国南部低地和沼泽区的一种半水生毒蛇（食鱼蝮 蝮属） 也作 cottonmouth

2. Any of various similar but harmless water snakes.
几种类似却无毒的水蛇之任一种