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| low pollution | |||
| 低污染: 45 phrases in 14 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Chemistry | 2 |
| Drilling | 1 |
| Earth sciences | 1 |
| Ecology | 4 |
| Electronics | 2 |
| General | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Space | 2 |
| Technology | 22 |
| Water resources | 4 |
| Wind Energy | 1 |
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