关于“snake”的英语谚语，综合多个权威来源整理如下：

一、性格与行为类

A snake in the grass

意思：隐藏的敌人或虚伪的人。 例句：Be careful of him—he’s a real snake in the grass.

文化背景：源自拉丁语谚语，形容表面无害实则危险的人。

Once bitten, twice shy

意思：一朝被蛇咬，十年怕井绳。 例句：After the incident, I was cautious about everyone I met.

文化背景：源自中国谚语，比喻受过一次伤害后过于谨慎。

Snakes can’t change their nature

意思：人的本性难改。 例句：He's always aggressive, just like a snake can’t change its nature.

类似表达：A leopard can’t change its spots.（老虎的斑纹改不了）。

二、处世哲理类

Draw a snake and add feet

意思：画蛇添足，多此一举。 例句：Stop adding features to the project； it's already perfect.

文化背景：中国成语，比喻做事过头反而坏事。

Cold as a snake

意思：冷酷无情。 例句：She's as cold as a snake； she doesn't care about anyone's feelings.

文化背景：直接描述蛇的生理特性，引申为性格冷漠。

三、危险警示类

When you're in the snake's mouth, keep still

意思：身处险境需保持沉默。 例句：The enemy was in our trap； we had to remain silent to avoid detection.

文化背景：强调在危险情况下保持警惕的重要性。

A snake in the grass may bite you without your knowing

意思：草丛中的蛇可能突然袭击。 例句：Always be aware of your surroundings； a snake in the grass may bite you without your knowing.

文化背景：提醒人们对潜在危险保持警惕。

四、其他相关表达

The snake that slits its own throat is the slyest of all

意思：自断后路的蛇最狡猾。 例句：He cut off all ties with his former colleagues, just like the slyest snake.

A snake may bite without its tongue being heard

意思：蛇咬人前可能不发声音。 例句：The attacker was silent until it was too late.

Cold as a snake（副词短语）

意思：极度冷漠。 例句：He's cold as a snake； his indifference is unbearable.

这些谚语通过蛇的特性，形象地表达了人性、处世态度或自然现象，是英语学习中常用的文化素材。