 |
| |||
| choke stone; key stone | |||
|
中 心石 : 42 phrases in 14 subjects |
| Air defense | 1 |
| Construction | 1 |
| Earth sciences | 5 |
| Economy | 7 |
| Electronics | 1 |
| Environment | 3 |
| General | 3 |
| Geology | 2 |
| Mechanics | 1 |
| Mining | 2 |
| Navigation | 2 |
| Oil / petroleum | 10 |
| Technology | 3 |
| United Nations | 1 |
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