 |
| |||
| breathing zone | |||
| 呼吸带: 13 phrases in 6 subjects |
| Automobiles | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 8 |
| Textile industry | 1 |
| United Nations | 1 |
|
| |||
| breathing zone | |||
| 呼吸带: 13 phrases in 6 subjects |
| Automobiles | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 8 |
| Textile industry | 1 |
| United Nations | 1 |