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venom of [animal]
The venom of a cobra can be deadly.
眼镜蛇的毒液可能是致命的。
毒液
先理解核心含义，再看它在真实句子里的用法。
毒液
a poisonous substance produced by some animals, used to attack prey or defend themselves
The venom of a cobra can be deadly.
眼镜蛇的毒液可能是致命的。
用于防御或攻击的动物毒素；通过咬、蜇等传递的生物毒液,用于保护动物或杀死猎物。
An animal toxin intended for defensive or offensive use; a biological poison delivered by bite, sting, etc., to protect an animal or to kill its prey.
带有恶意或怨恨的情感或言语；尖刻。
Feeling or speech marked by spite or malice; vitriol.
The snake's venom can kill a mouse within seconds.
这条蛇的毒液能在几秒钟内杀死一只老鼠。
Some spiders inject venom into their prey to paralyze it.
有些蜘蛛会向猎物注入毒液，使其麻痹。
The venom from a bee sting may cause pain and swelling.
蜜蜂蜇伤产生的毒液可能会引起疼痛和肿胀。
The venom of a cobra can be deadly.
眼镜蛇的毒液可能是致命的。
此处 venom 为比喻用法，表示强烈的敌意。
She spoke with venom in her voice.
她说话时声音里带着恶意。
There was real venom in his criticism.
他的批评中充满了真正的恶意。
Not this
The spider's venom bite was painful.
Use this
The spider's venomous bite was painful.
中文中“毒”可以作名词或形容词，但英语中venom是名词，描述含有毒液的特性需用形容词venomous。所以应将venom改为venomous。
Not this
Venoms are harmful to humans.
Use this
Venom is harmful to humans.
venom作为毒液的总称时为不可数名词，无需加复数。使用复数venoms需特指多种类型的毒液，但在此泛指所有毒液时应该用单数。