【化】 catalyst up-flow principle
activator; catalyzer
【计】 catalyst
【化】 catalyst; catalyzator; catalyzer
【医】 accelerant; catalyst; catalytic agent; catalyzator; catalyzer
contact substance
【机】 upstream
elements; philosophy; principium; principle; theory
【化】 principle
【医】 mechanism; principle; rationale
【经】 ground work; principle