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| 无污染的 | |||
| 清洁的【核】 | |||
| 无污染 (的) | |||
| |||
| 无污染 | |||
| 无公害的 | |||
| 无污染的 | |||
| pollution free: 27 phrases in 11 subjects |
| Agriculture | 1 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Ecology | 5 |
| Economy | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 11 |
| Wind Energy | 1 |
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