介绍： 真题原文：We’ve talked recently about the importance of sustainable energy. We’ve also talked about the different theories on how that can be done. So far, our discussions have all been theoretical.

theoretical: that could possibility exist, happen or be true, although this is unlikely

Eg: It's a theoret...

介绍： 真题原文：We’ve talked recently about the importance of sustainable energy. We’ve also talked about the different theories on how that can be done. So far, our discussions have all been theoretical.

theoretical: that could possibility exist, happen or be true, although this is unlikely

Eg: It's a theoretical possibility.