如果没有真正的无毒蛇，那些所谓的无毒蛇，比如蟒蛇和巨蟒，在它们进化过程中的某个阶段是有毒的吗？
If there are no truly non-venomous snakes, were the so-called non-venomous snakes, like constrictors and pythons, were they venomous at some point in their evolution?
黄颌蛇，你可能也听过这种蛇，虽然它们经常被归类为毒蛇，但实际上它们通常是无毒的。
Colubrids, and you probably heard this too, although they are often classified as venomous snakes, they are actually generally non-venomous.
1994年至1997年作者对安徽省皇甫山自然保护区的蛇类资源进行了调查，共发现蛇类11种，其中有毒蛇3种，无毒蛇8种。
By the survey of snakes in Huangfu Shan Natural Preservation Fields from 1994 to 1997, the author has found 11 kinds of snakes, in all with one to several specimens of each kind except T. stejnegeri.
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