機車為所有機動車輛中數目最多之車種，也因此造成其為公路運輸部門第二大二

機車為所有機動車輛中數目最多之車種，也因此造成其為公路運輸部門第二大二氧化碳排放量來源

結果 (英文) 1:

Locomotives for all motor vehicles topped the list of the vehicles, also resulting in the road transport sector the second largest source of carbon dioxide emissions

結果 (英文) 2:

Locomotive for all motor vehicles in the largest number of vehicles, and thus causing its second largest carbon dioxide emissions from the road transport sector sources

結果 (英文) 3:

The locomotive is the largest number of vehicles in all motor vehicles, and it is therefore the source of the second largest carbon dioxide emissions in the road transport sector.