portaln.入口；大门；门静脉；[计]门户adj.门静脉的；肝门的portal crane门座起重机portal/RA门静脉／放射摄影术portal shaft峒门坑portal robot门式机器人portal entry进入门户portal heart门脉心Portal tract肝门束portal strut桥门斜支架portal canal门脉管portal hoist闸墩