- 
				           		人为来源可以包括机动车辆、工业燃料燃烧和制造业务。
						        					            	 Manmade sources can include motor vehicles, and industrial fuel burning, and manufacturing operations.
								    										 
								    				            	 youdao 
- 
				           		人为来源可以包括机动车辆、工业燃料燃烧和制造业务。
						        					            	 Manmade sources can include motor vehicles, and industrial fuel burning, and manufacturing operations.
								    										 
								    				            	 youdao