 |
| 封盖: 186 phrases in 31 subjects |
| Agriculture | 4 |
| Animal husbandry | 2 |
| Automobiles | 11 |
| Aviation | 2 |
| Basketball | 1 |
| Beekeeping | 2 |
| Biology | 1 |
| Business | 1 |
| Chemistry | 1 |
| Compressors | 5 |
| Drilling | 9 |
| Electric machinery | 3 |
| Electronics | 21 |
| Engineering geology | 2 |
| Figure skating | 1 |
| General | 8 |
| Hydroelectric power stations | 4 |
| Metallurgy | 9 |
| Mining | 1 |
| Molecular genetics | 1 |
| Nautical | 2 |
| Oil / petroleum | 10 |
| Packaging | 6 |
| Pest control | 1 |
| Plastics | 4 |
| Rail transport | 3 |
| Shipbuilding | 3 |
| Space | 3 |
| Technology | 60 |
| Telecommunications | 1 |
| Wind Energy | 4 |