【化】 linking group
connect; join; joint; juncture; link
【计】 bussing; catenation; connection; interfacing; join; linkage; linking
【化】 connection
【医】 connection; couple; coupling; union
【经】 link
base; basic; foundation; key; primary; radix
【化】 group; radical
【医】 base; basement; group; radical