奥林匹克公园内采用零排放车辆和超低排放车辆。
In the Olympic Green, no emission or ultra-low emission vehicles will be used.
地排放车辆——比当前要求规章车辆符合更严格排放标准的一个级别车辆。
Low emission vehicles — a class of vehicles that can satisfy much more stringent emissions standards than currently imposed on conventional vehicles.
届时，黄标车(高污染排放车辆)将从路面上消失，这是持续两年多努力的结果。
That will come at a time when "yellow label cars" - those heavy-polluting vehicles - have been cleaned up off the road after a more-than-two-years effort.
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