 |
| |||
| casing ring | |||
| girdle | |||
| 壳环: 29 phrases in 9 subjects |
| Chemistry | 2 |
| Electronics | 5 |
| Environment | 1 |
| General | 3 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 6 |
| Plastics | 1 |
| Space | 2 |
| Technology | 8 |
|
| |||
| casing ring | |||
| girdle | |||
| 壳环: 29 phrases in 9 subjects |
| Chemistry | 2 |
| Electronics | 5 |
| Environment | 1 |
| General | 3 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 6 |
| Plastics | 1 |
| Space | 2 |
| Technology | 8 |