Throat is a type of Opening. Throat is related to Breathing. Breathing is related to Exercise. Dancing can cause/lead to Exercise. 
River is related to Boat. you are likely to find Boat in/at/on Lake. Lake have Fluid. 
Opening <--IsA-- Throat <--RelatedTo--> Breathing <--RelatedTo--> Exercise <--Causes-- Dancing 
River <--RelatedTo--> Boat --AtLocation--> Lake --HasA--> Fluid 