 |
| |||
| operation material | |||
| 工作物质: 17 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Construction | 1 |
| Engineering geology | 1 |
| Environment | 1 |
| Geology | 1 |
| Nuclear and fusion power | 1 |
| Technology | 8 |
| United Nations | 2 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips