 |
| 火花隙: 111 phrases in 17 subjects |
| Air defense | 2 |
| Architecture | 2 |
| Automobiles | 18 |
| Construction | 1 |
| Electric machinery | 2 |
| Electricity generation | 1 |
| Electronics | 26 |
| General | 3 |
| Metallurgy | 2 |
| Nautical | 1 |
| Oil / petroleum | 3 |
| Plastics | 1 |
| Racing and motorsport | 2 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Technology | 44 |
| Wind Energy | 1 |