| |||
| 循环管线 | |||
|
pipe loop : 23 phrases in 10 subjects |
| Chemistry | 1 |
| Compressors | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 5 |
| Plastics | 2 |
| Refrigeration | 1 |
| Space | 3 |
| Technology | 6 |
| |||
| 循环管线 | |||
|
pipe loop : 23 phrases in 10 subjects |
| Chemistry | 1 |
| Compressors | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 5 |
| Plastics | 2 |
| Refrigeration | 1 |
| Space | 3 |
| Technology | 6 |