 |
| 消除污染: 53 phrases in 15 subjects |
| China | 1 |
| Commerce | 1 |
| Desert science | 2 |
| Ecology | 3 |
| Economy | 1 |
| Electronics | 18 |
| Environment | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Nuclear physics | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 16 |
| United States | 1 |
| Water resources | 2 |