与此同时，内燃机的排气污染是环境保护中的一大难题，而它与燃料品质有着密切关系。
At the same time, exhaust pollution of internal combustion engine is a big issue on the environment protection, which is directly related with quality of the fuel.
与此同时，内燃机的排气污染是环境保护中的一大难题，而它与燃料品质有着密切关系。
At the same time, exhaust pollution of internal combustion engine is a big issue on the environment protection, which is directly related with quality of the fuel.
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