| 1 | When I was a child, I lived in the countryside, and life was very hard. | |
| 2 | This project requires extended and arduous practice. | |
| 3 | He received rigorous and demanding training from a young age. | |
| 4 | Military training was very difficult, but all the students persevered. | |
| 5 | After much adversity, he was finally admitted to his dream university. |