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| English | Chinese |
| Clean Air Act | 美国清洁空气法案 |
| clean air projector | 清洁空气规化【发起】人 |
| clean development mechanism | 无污染开发机制 |
| Clean Energy Research Institute | 美国迈阿密大学清洁能源研究所 |
| Clean Gulf Associates | 美国净化墨西哥海湾联合体 |
| clean natural gas vehicle | 清洁天然气车 |
| cleaning up The process of bringing desert, marsh, sea coast or other waste or unproductive land into use or cultivation | 清理 (使用或者培养沼泽地带、沙漠、海岸或其他废弃或贫瘠的土地的过程。) |
| dry cleaning To clean fabrics etc. with a solvent other than water | 干洗 (用溶剂而非用水来清洗纺织品。) |
| Environmental Clean up and Responsibilities Act | 美国环境净化与责任条例 |
| Federal Clean Air Act | 联邦清洁空气法案 |
| Oil Companies International Study Group for Conservation of Clean Air and Water | 石油公司保护净化空气和水资源国际研究组 |
| oil spill clean-up technology | 石油泄漏清除技术 |
| street cleaning The process of removing dirt, litter or other unsightly materials from city or town streets | 清洁街道 (从其他城市或城镇街道去除污垢，垃圾或不雅观材料的过程。) |