求翻译：冶金、石化行业的一、二类压力容器以及空冷设备的设计、生产、现场安装。近些年一直从事火力电厂的空冷设备的设计、生产及现场安装。是什么意思？

Metallurgy, petrochemical industry, first and second class pressure vessels and air cooling equipment design, production and site installation. Thermal power plants in recent years has been engaged in the design of air-cooling equipment, production and site installation.

metallurgy, petrochemical industries, category 2 pressure vessel and air-cooling equipment design, production, on-site installation. In recent years it has been engaged in fire power plants to the air-cooling equipment design, production and on-site installation.

Metallurgy, petrified profession one, two kind of pressure vessel as well as air cooled equipment design, production, scene installment.The recent years are engaged in the firepower power plant continuously the air cooled equipment design, the production and the scene installment.

One or two categories of pressure vessels of the metallurgical industry, petrochemical industry and air cooling equipment design, production, field installation. In recent years has been engaged in the thermal power plant air cooling equipment design, production and field installation.

One or two categories of pressure vessels of the metallurgical industry, petrochemical industry and air cooling equipment design, production, field installation. In recent years has been engaged in the thermal power plant air cooling equipment design, production and field installation.