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| 光化学污染 | |||
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| 光化学污染 (一种大气污染，使空气中的臭氧和其它化合物发生作用而形成的氮氧化物和碳氢化合物，尤其是在汽车尾气中。) | |||
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photochemical pollution : 2 phrases in 2 subjects |
| Desert science | 1 |
| Metallurgy | 1 |
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