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| improve the environment | |||
| environmental enhancement | |||
| to improve the environment | |||
| 改善环境: 27 phrases in 14 subjects |
| Aviation | 1 |
| Business | 1 |
| China | 2 |
| Desert science | 1 |
| Earth sciences | 4 |
| Ecology | 4 |
| Economy | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Management | 1 |
| Name of organization | 1 |
| Plastics | 1 |
| Space | 1 |
| Technology | 7 |
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