in theory

理论上

例句与用法：

It sounds fine in theory, but will it work?

道理是不错，但能否行得通?

It may be so in theory, but how will it work in practice?

理论上也许是如此，但是在实际上怎样才能行得通呢？

His proposition is good in theory but cannot be put into practice.

他的建议在理论上可以，但不能付诸实现。

It is so in theory.

理论上是如此。

详细释义：

ph.

理论上