If superior vena caval obstruction lies above the azygosvein, it acts as a bypass collateral to the right atrium. 如果上腔静脉阻塞位于奇静脉之上,奇静脉就成为一条通入右心房的旁路侧支循环。
There is a full line size bypass around the seal leg condensate rotameter for fast re-filling of the seal leg. 密封管冷凝液转子流量计前后设有一条全尺寸的旁路,用于密封管快速重注。