on paper
在理论上或表面上，看起来是可行或成功的，但实际上可能并非如此。
口语·对比理论与实际
英文释义
based on what is written or planned, rather than what actually happens or is true
例句
The plan looks great on paper, but it might not work in reality.
典故来源
源自书面记录与实际情况的对比，强调理论上的可行性。