![]() |
| |||
clean air | |||
scavenging air |
清洁空 气 : 33 phrases in 14 subjects |
Automobiles | 5 |
Aviation | 3 |
Business | 1 |
Chemistry | 1 |
Ecology | 3 |
Electronics | 2 |
Environment | 4 |
Household appliances | 1 |
Management | 1 |
Oil / petroleum | 1 |
Oil processing plants | 2 |
Refrigeration | 2 |
Shipbuilding | 3 |
Technology | 4 |