相关Fordecadesitisgenera的文学知识

问题详情：  Fordecades,itisgenerallybelievedthatmiddlechildren-----thoseborninbetweenolderandyoungersiblings(兄弟姐妹)---tendtohaveahardtimegrowingup.  Withintheirfamilies,middlechildrenaresaidtoben...