A toad wishing to eat swan meat

A: Today I told a gorgeous girl that I love her.
B: What did she say?
A: She said shi she is really not good enough for me, a man who is so ambitious like myself?
B: What do you mean by "so ambitious"?
A: A toad whising longing to eat swan meat the meat of a swan (An ugly and poor man hopes to marry a pretty girl) 


A今天我和女神表白了

B她怎么说？

A她说我实在是配不上你这样一个有着凌云之志的男人

B什么凌云之志？

A癞蛤蟆想吃天鹅肉

这个小故事真的难以翻译成英文。直接翻译成语可能带来很多的不便  对我来说你该精确地解释这个成语的含义。比如说最后一排可能当成： 

A: This man represents a toad who is longing to eat the meat of swan. The pretty girl values ambition or character traits over beauty and wealth. 

除了说明以外有的时候在英语中可能存在一个相近表现  譬如“She's way out of his league"

Hope this helps. Though I'm not an expert.