However, in fixing emission standards and timetables applicable to various pollution sources and pollutants, the Administrator in some cases is required to consider economic and technological difficulties of compliance.

• 然而，在决定排放标准和适用于各种各样的污染源及污染物排放的时间表时，要求局长考虑遵守标准所遇到的经济或技术方面的困难。