【医】 reverse valves
defend; guard against; prevent
athwart; contradictorily; counter; disobey; go against; inverse
【医】 contra-
cut; section; sever; stop
class; door; gate; gateway; ostium; phylum; school
【计】 gate
【医】 binary division; hili; hilum; hilus; phylum; pore; Pori; porta; portae
portal; porus; pyla
【经】 portal