HOVCOCA⁴⁷⁶⁷⁰ 基本例句 High Frequency Oscillatory Ventilation Developed countries like America often offer the traffic priority for the high occupancy vehicle HOV to detract the traffic congestion, protect environment and save resources. 美国等交通发达国家为减少道路交通拥挤程度，保护环境质量，节约资源，往往为载客人数较多的车辆 HOV提供道路交通优先权。 cnki