Anti-venin is what they give people after they have been bitten by a poisonous snake.

抗蛇毒血清是用来给被毒蛇咬伤的人注射的。

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In the darkness, she did not see it. It was a poisonous snake whose tail was caught in the trap.

在黑暗中，她没有看见它，其实它是一条毒蛇，它的尾巴掉进了陷阱里。

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A 66-year-old Florida mailman doing his rounds was bitten by a poisonous snake when he put mail inside a mailbox.

一位66岁的佛罗里达邮递员正在送信，当他往一个邮箱塞信的时候，一条有毒的蛇了他一口。

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The students found a poisonous snake once, but it was already dead.

NEWYORKER: The Sanctuary

Similarly, when an octopus changes skin color in self-defense, such as by mimicking a poisonous sea snake, the decision may come not from central command but from the skin itself.

WSJ: The Brains of the Animal Kingdom