 |
| |||
| corundum | |||
| 刚玉、刚石: 12 phrases in 6 subjects |
| Aviation | 1 |
| Construction | 1 |
| General | 1 |
| Metallurgy | 5 |
| Space | 1 |
| Technology | 3 |
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