expansion joint [建] 伸缩缝补偿器[机] 伸缩接头膨胀节或缝 [网络短语] expansion joint 伸缩缝,膨胀节,伸缩接头 expansion rail joint 钢轨伸缩调节器,温度调节器 expansion-joint filler 伸缩缝填料