它们用锋利的牙齿将毒液注入被捕食的昆虫体内。
They use their sharp teeth to force poison into the insects they catch for food.
为了将剧毒的毒液注入人的血液，眼镜蛇必须将头竖起挤出毒牙里的毒液。
To infuse its lethal venom into the bloodstream, a cobra must turn its head, squeezing out poison that's connected to its fangs.
你一定要对坏人发出嘶嘶声，一定要恐吓他们，以免他们会伤害你，但不要把自己的毒液注入他们的身体。
So you must hiss at wicked people. You must frighten them lest they should do you harm. But never inject your venom into them.
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