垂涎三尺的英文：
[Literal Meaning]
hang/saliva/three/foot
One's saliva droops as long as three feet.

[解释]
流出的口水有三尺长。形容嘴馋或者贪婪。

[Explanation]
gluttonous or greedy

[例子]
文物贩子早就对他家里那件商朝青铜器垂涎三尺了。

[Example]
The bronze cauldron of Shang Dynasty in his house has made the antique vendors' mouth water.

[英文等价词]
to make sb.'s mouth water

Make one's mouth water
使人垂涎三尺

His mouth watered at the sight of roast.
他看见烤肉就垂涎三尺。

"When he smelled the delicious food, he smacked his lips."
闻到美味的食物令他垂涎三尺。

Pygmalion, who coveted his treasures, caused him to be put to death
皮格马利翁对他的财宝垂涎三尺，把他置于死地。

Denmark, Poland, and Russia each desired parts of Sweden's exposed baltic empire
丹麦、波兰和俄国都对它们面前的这个波罗的海帝国瑞典的某些部分垂涎三尺。