Airport is related to Tower. you are likely to find Tower in/at/on City. you are likely to find Restaurant in/at/on City. you are likely to find Gentleman in/at/on Restaurant. 
Tongue is a type of Organ. one thing you do when you Kiss is Tongue. Kiss is related to Feeling. Feeling is related to Content. 
Airport <--RelatedTo--> Tower --AtLocation--> City <--AtLocation-- Restaurant <--AtLocation-- Gentleman 
Organ <--IsA-- Tongue <--HasSubevent-- Kiss <--RelatedTo--> Feeling <--RelatedTo--> Content 