secondary division of gas cleaning

例句：

1. 1.The secondary division of the city's transportation system is crucial for efficient traffic flow.
   城市交通系统的次级分部对于高效的交通流至关重要。
2. 2. The chemical industry uses a variety of secondary divisions to produce different chemicals.
   化学工业使用各种次级分部来生产不同的化学品。
3. 3. The secondary division of the company's research and development department focuses on innovation and technology advancement.
   公司研发部门的次级分部专注于创新和技术发展。