求翻译：1996年12月31日前建成投产或通过建设项目环境影响报告书审批的新建、扩建、改建火电厂建设项 目，执行第1时段排放控制要求。是什么意思？

December 31, 1996 put into operation or through the construction project environmental impact report for approval of new construction, expansion, renovation thermal power plant construction project, the first time the implementation of emission control requirements.

By 31 December 1996, through construction projects completed and put into production or environmental impact report for approval of new construction, expansion, upgrading fire building power plants, and the project implementation time 1 Emission control requirements.

December 31, before 1996 completed the production or through the items of basic construction environmental effect report examination and approval newly built, the extension, rebuilds the thermoelectric power station items of basic construction, carried out the 1st time interval emissions control req

Before December 31, 1996, completion of construction project environmental impact report for approval on or through the new, expanded and reconstructed construction of thermal power plant project, 1th emission control requirements.

December 31, 1996 put into operation or through the construction project environmental impact report for approval of new construction, expansion, renovation thermal power plant construction project, the first time the implementation of emission control requirements.