 |
| |||
| 一根管子的 | |||
| 单管的 | |||
| 单管式 | |||
| one-pipe: 49 phrases in 5 subjects |
| Automobiles | 1 |
| Ecology | 1 |
| Hydroelectric power stations | 1 |
| Refrigeration | 4 |
| Technology | 42 |
|
| |||
| 一根管子的 | |||
| 单管的 | |||
| 单管式 | |||
| one-pipe: 49 phrases in 5 subjects |
| Automobiles | 1 |
| Ecology | 1 |
| Hydroelectric power stations | 1 |
| Refrigeration | 4 |
| Technology | 42 |