《管子·轻重丁》
在过去两国的不断冲突中，还要把交界上孤立突出的地盘让给鲁国。
三败杀君二重臣定社稷者，吾此皆以孤突之地封者也。
In the past, among the incessant conflicts between the two countries, the isolated and abruptly jutting out territory on the borders had to be ceded to the State of Lu.