Enhance is a synonym of Perfect. Perfect is related to Top. Top is related to Pot. Pot is a type of Stake. 
Fishing is a type of Sport. Fishing can cause/lead to Sleep. one thing you do when you Sleep is Breathing. Breathing is related to Sigh. 
Enhance <--Synonym--> Perfect <--RelatedTo--> Top <--RelatedTo--> Pot --IsA--> Stake 
Sport <--IsA-- Fishing --Causes--> Sleep --HasSubevent--> Breathing <--RelatedTo--> Sigh 