class of emission

例句：

1. 1. The company's emissions are monitored to meet environmental standards.
   该公司的排放物受到监控，以符合环境标准。
2. 2.The research focused on the classification of different types of emissions.
   该研究专注于不同类型排放物的分类。
3. 3. The new policy aims to reduce emissions from transportation and industrial processes.
   新政策旨在减少交通运输和工业过程的排放。