短语词组短语obstructed flow 阻塞流ventilation obstructed 通风不畅obstructed stream 阻塞河obstructed distance 障碍距离light obstructed 遮光效应be obstructed 窒碍obstructed spillway 设闸溢洪道obstructed vision 妨碍视线Biliary obstructed 胆管阻塞 返回 obstructed