没齿不忘

Explanation: No teeth: for life. Never forget. 　　Usage: Partial official; as predicate; for written language 　　Source: Han Zhang Heng "Simultaneous Song": "Le Moss Night Music, Yan can not forget the teeth." Thesaurus:  Bear in mind Lou Bone, Muscle moment ingrained, be engraved in the bones and imprinted on the heart, Ingrained Lou Heart, Carved hunger ingrained, imprint, Heart Journal ingrained, Juan bone bear in mind, embedded in one's memory, through one's life-time retain, to remember (a favor) as long as one lives, to bear in mind always, Mingjilougu