revolving door
change; revolution; rotate; transfer; turn
【医】 meta-; spin; tour; turn
【经】 pass
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