| 1 | Dawson and his students hope to solve one of the most puzzling aspects of the world' s oceans: where they get all their energy. | |
| 2 | Your ideas seem very obscure to me. | |
| 3 | This passage is really hard to understand. | |
| 4 | That means that there is a puzzling duality to China's character: we often say that it is both big and small, strong and weak. | |
| 5 | If you're going to say something obscure, why not use an obscure language? |
