mindmap root((纪念)) keep suggests a customary or wonted noticing without anything untoward or inappropriate: ~ the Sabbath. observe suggests marking the occasion by ceremonious performance of required acts or rituals: not all holidays are ~d nationally. celebrate suggests the acknowledging of an occasion by festivity or indulgence: traditionally ~s Thanksgiving with a huge dinner. commemorate suggests the marking of an occasion by observances that remind one of origin and significance: ~ Memorial Day with the laying of wreaths.