circulation oil循环油circulationn.流通；循环；发行量；消息传播circulation bump start- up system循环泵启动系统circulation of the primary products农产品流通circulation cross according to time循环按趟交叉Circulation cost of export commodity出口商品流动费用circulation industry competitiveness流通竞争力Circulation and Collection subsystem典藏流通子系统circulation of agricultural products农产品流通circulation type x-ray tube cooler循环型X线管冷却器Circulation of the agricultural land农地流转Circulation pattern of the atmosphere大气环流模式