He unwarily treads upon a viper asleep just before his feet. 他不小心踩到正睡在他脚前的蛇上。
Rattlesnakes belong to the viper family. 响尾蛇属于蛇科。
Any of several venomous snakes of the genus Cerastes, such as the horned viper, having hornlike projections over each eye. 冠雉的一属(形似火鸡的一种树栖鸟,常被用于比赛和食用)。
The Viperidae (vipers) are a family of venomous snakes found all over the world, except in Antarctica, Australia, New Zealand, Madagascar, Hawaii, various other isolated islands, and north of the Arctic Circle. All have relatively long, hinged fangs that permit deep penetration and injection of venom. Four subfamilies are currently recognised. They are also known as viperids.