đường chim bay

== Vietnamese == === Etymology === Compound of đường (“road, way”) +‎ chim (“bird”) +‎ bay (“to fly”). === Pronunciation === (Hà Nội) IPA(key): [ʔɗɨəŋ˨˩ t͡ɕim˧˧ ʔɓaj˧˧] (Huế) IPA(key): [ʔɗɨəŋ˦˩ t͡ɕim˧˧ ʔɓaj˧˧] (Saigon) IPA(key): [ʔɗɨəŋ˨˩ cim˧˧ ʔɓa(ː)j˧˧] === Noun === đường chim bay beeline; distance along the straight line between two geographical points on the map