也许在以前的生物课上，你学过蛇是由蜥蜴进化而来的，而且最初的蛇是没有毒的，后来出现了更高级的蛇，也就是毒蛇。
Probably back in some previous biology course you learned that snakes evolved from lizards, and that the first snakes weren't venomous and then along came more advanced snakes, the venomous snakes.
我不了解你的情况，但我是不愿购买任何有毒的东西。
I do not know about you but I would rather not buy toxic anything.
这种果汁，就它本身而言，是没有毒的。但是你吃药的时候和着葡萄柚汁，就得小心了。
The juice, itself, is not toxic, but you should be careful taking medicine with any grapefruit.
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