Moderate is a synonym of Decrease. Decrease is the opposite of Soar. 
Service is related to Plate. you are likely to find Sandwich in/at/on Plate. Bread is part of Sandwich. you are likely to find Bread in/at/on Refrigerator. 
Moderate <--Synonym--> Decrease <--Antonym--> Soar 
Service <--RelatedTo--> Plate <--AtLocation-- Sandwich <--PartOf-- Bread --AtLocation--> Refrigerator 