《礼记·服问》
本来正在服三年之丧，但又遇上了长疡、中疡之丧，虽然此时前丧已经易麻为葛，仍然要改服后丧的麻带。
以有本为税。殇：长、中，变三年之葛。
Although the three-year mourning period is in progress, there is still a period of mourning for Chanyang and Zhongyang. Even though the previous mourning has been changed from Ma to Ge, it is still necessary to change to the hemp belt of the latter mourning.