想得美 (英國退歐盟等等)：又要馬兒跑，又要牠不吃草：You can't have your cake and eat it

The Prime Minister offered to have her cake or eat it

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The EU just rinsed Theresa May on Instagram

Rinse the dishes after you wash them. (Britain, slang) To thoroughly defeat in an argument, fight or other competition.

rinse - Wiktionary

https://en.wiktionary.org/wiki/rinse

You can't have your cake and eat it - Wikipedia

https://en.wikipedia.org/wiki/You_can%27t_have_your_cake_and_eat_it

The proverb literally means "you cannot simultaneously retain your cake and eat it". Once the cake is eaten, it is gone. It can be used to say that one cannot or should not have or want more than one deserves or is reasonable, or that one cannot or should not try to have two incompatible things.

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