Definition
- C1
used to express that something may be acceptable in theory but has practical problems or is not truly acceptable.
虽然不错，但是
Your theory is all very well, but putting it into practice is not easy.
你的理论固然很好，但要付诸实践并不容易。
It's all very well to say that, but doing it is another matter.
说起来容易，但做起来是另一回事。
It's all very well to be wise after the event, but it wasn't so clear at the time.
事后诸葛亮固然很好，但在当时并不那么清楚。