Manmade sources can include motor vehicles, and industrialfuel burning, and manufacturing operations.
人为来源可以包括机动车辆、工业燃料燃烧和制造业务。
2
They mainly come from plasticizer in plastics and resins, and also partly come from burning of industrialfuel.
其主要来源于塑料和树脂工业中广泛使用的增塑剂，也有相当部分来源于工业燃料的燃烧。
3
The ways of natural gas utilization-power generation, production of synthetic raw material gas, industrialfuel, vehicle fuel and city gas are analyzed.