毒素广泛地存在于人体的内外，外毒易被人们认知而内毒却易被人忽略。
The external toxin is easily found but the internal toxin is hard to be known.
这个毒株内少量遗传差异的含义也并不清楚。
The implications of the slight genetic differences in this strain are also not known.
有些眼镜蛇的毒，强到足以在15分钟内让人致命。
Some cobras' poison is strong enough to kill a person in 15 minutes.
有些眼镜蛇的毒，强到足以在15分钟内让人致命。
Some cobras' poison is strong enough to kill a person in 15 minutes.
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