美国交通部正着手鼓励在交通沿线兴建设施，并延伸公交巴士，地铁以及自行车的行车路线，以及降低废气排放。
The DoT is already encouraging plans to build housing near transport, expand access to buses, subways and bicycles, and reduce emissions in the process.
不过，有技术人员说，单独地采用EGR技术并不能达到降低废气排放的目的，还必须配合中冷技术一起使用。
However, technical personnel, by an EGR technology alone does not to reduce emissions, but also must cooperate inter-cooled technology are used together.
这样通过调节电磁阀就可以实现发动机在不同工况下有最佳的供油提前角与之匹配，从而达到改善发动机经济性和动力性并降低废气排放之目的。
That the optimum fuel injection timing corresponding to one operating mode of engine is determined by adjusting the solenoid valve can improve economy and power, and lower the emissions of engine.
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