要想把圆变成方的，那几乎是不可能的事。“Square the circle 化圆成方” 这个说法源于古代希腊几何学的一道作图问题，由于长久以来一直没能找到题解，所以人们现在用 “square the circle” 或 “square a circle” 来比喻 “做一件很难办到，甚至是不可能的事”。

例句

You can't have a stable office job whilst being a world traveller. You're trying to square the circle!

想在做一名环游世界旅行者的同时有一份稳定的工作是非常困难的。你这是在做不可能的事。

I want to get married but I also want to be single! I think I might be trying to square the circle here.

我既想结婚，又想要单身！我觉得这简直是像化圆成方一样困难。

He wanted a new, fast sports car at a low price! I told him he was trying to square a circle!

他想以低价购买一辆又新又快的跑车。我告诉他这是不可能的！