natural gas refining

例句：

1. 1. The refinery processes natural gas toproduce a variety of products.
   炼油厂将天然气加工成各种产品。
2. 2. The processof natural gas refining is complexand requires specialized equipment.
   天然气精炼过程复杂，需要专用设备。
3. 3. Natural gas refining is an important source of energy formany countries.
   天然气精炼是许多国家的重要能源来源。