1, "You can't have your cake and eat it" doesn't mean that you can't have your cake and eat it, but it emphasizes how we should choose when you can't have your cake and eat it. There are also good things in both, not too much, otherwise it will not reflect its value, which is intended to remind people how to choose when faced with trade-offs.

2. The idiom "You can't have your cake and eat it" comes from Mencius' Fish I Want: "Fish, I want it, and bear's paw also wants it; You can't have your cake and eat it. You can't have your cake and eat it. Fish is what I want; Bear's paw is what I want, too If I can't have both, I can only give up fresh fish and want bear's paw.

Extended information "The Fish I Want" This article is taken from "Mencius Gaozi". The main content of Gao Zi Shang is to clarify the theory of "goodness in nature", that is, there are seeds of goodness in human nature and everyone has the so-called "compassion"; Everyone has a heart of shame and evil; Everyone has a respectful heart; Everyone has a right and wrong heart. "This kind nature is people's' initial heart'.