 |
| 坚固的: 51 phrases in 16 subjects |
| Architecture | 7 |
| Automobiles | 5 |
| Bowling | 1 |
| Bridge construction | 1 |
| Chemistry | 1 |
| Earth sciences | 3 |
| Economy | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Football | 2 |
| General | 12 |
| Hydroelectric power stations | 3 |
| Space | 1 |
| Sports | 1 |
| Technology | 9 |
| Telecommunications | 1 |
| Tools | 1 |