矿物名。即氧化物矿物褐铁矿的结核。中医用以入药﹐有安神镇惊﹑止血定痛之功效。古人以为是生于蛇腹中之物﹐或以为是蛇蛰伏时口含之物。又称蛇含石。
而另一种蛇类，黄颌蛇，并不完全属于任何一个类别。
Another family of snakes, the colubrids, don't really fit neatly into either category though.
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.
将黄颌蛇与其他被我们归类为毒蛇的蛇区别开来的，并不是它们没有毒液，而是缺乏一种将毒液输送到猎物体内的有效方法。
What separates colubrids from other snakes we have been classifying as venomous, is not the lack of venom, but the lack of an effective way to deliver the venom into its prey.
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