owpassagesidedbywallsofcourtyards.Betweentworowsofthehousesformsaseparatedspaceforventilation,daylightingandpassers-by.Hutongisthelane.Thesourcesoftheword“Hutong(胡同)”vary.monsayingisthatitsoriginalmeaningis“well”byMongolian.Theinitialpronunciationis“Hudong”.Anothersayingisthatitsoriginalmeaningis“Haote”(浩特)thatmeanscitiesandtownsbyMongolianandwasmispronouncedas“Hutong”duringitspropagation.ThethirdsayingisthatintheresidenceofMongolians,thetribesalittlebiggerthanvillageswerecalled“胡衕”(pronouncedas“Hutong”).AstheChinesecharactersof“胡衕”plicated,itwaslatersimplifiedas“胡同”(pronouncedasHutong).Somebelievedthatitwaspassageforfirepreventionandwascalled“Huotong(火疃)”or“Huoxiang(火巷)”.Later,itwascalled“Huotong”byBeijingersandbecame“Hutong”duringpropagation.(1)Introduction--AViewofHutong(1)AViewofHutong