| |||
| 结构环 | |||
|
structure ring : 32 phrases in 10 subjects |
| Agriculture | 3 |
| Astronomy | 1 |
| Chemistry | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Information technology | 2 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Space | 1 |
| Technology | 17 |
| |||
| 结构环 | |||
|
structure ring : 32 phrases in 10 subjects |
| Agriculture | 3 |
| Astronomy | 1 |
| Chemistry | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Information technology | 2 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Space | 1 |
| Technology | 17 |