1. Why cars consume more fuel ? 1. 车子为何会耗油？

Answer : Fuel molecules did not completely burned so it consumed more fuel, which caused the carbon accumulation day after day.
Suppose the fuel burned 70%, the rest unburned 30% will be wasted (consumed) and cause carbon accumulated as a result.


答：油分子未完全燃烧，所以耗油，再经日积月累就造成积碳！
假设：汽油燃烧70％未燃烧的30％不但浪费掉（耗油）且会变成积碳。