emission certification

例句：

1. 1. The company needs to obtain a valid emission certification to comply with environmental regulations.
   该公司需要获得有效的排放证明，以遵守环境法规。
2. 2. The manufacturer has to provide an emission certification for the new model car to meet emission standards.
   制造商必须为新款汽车提供排放证明，以满足排放标准。
3. 3.The government issued a new emission certification scheme to reduce air pollution.
   政府发布了新的排放认证计划，以减少空气污染。