求翻译：“既然汽油里面已经加入了清净剂，车子行驶时可以自行清洗燃油系统，为什么4S店和一些修理厂在为车子做养护的时候还要做喷油嘴清洗？”我们就喷油嘴保养的问题采访了相关的专业人士。是什么意思？

"Since gasoline which has joined the detergent can clean the fuel system in the car driving, why 4s shop and repair shop in the car to do the conservation we need to do a fuel injector cleaning?" We nozzle maintenance issues interview with the relevant professionals.

"Now that gasoline has been added to clean inside, the car can be driven to clean fuel system, and why 4 S shop and some repair plant conservation in the car when it has to be done the injector cleaning? "we are on the injector maintenance issues during an interview with the associated professionals