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1. Oxford Dictionary

   portal system

   • n.
     the system of blood vessels consisting of the hepatic portal vein with its tributaries and branches.；any system of blood vessels which has a capillary network at each end.

   • noun: portal system, plural noun: portal systems

2. • 更多解釋

   portal system

   • IPA[ˈpôrdl ˈsistim]

   • n.
     the system of blood vessels consisting of the portal vein with its tributaries and branches.

   Oxford American Dictionary